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Table 2 Full list of articles included in review organized according to topic category

From: The experiences of female surgeons around the world: a scoping review

 

Career challenges

Year

Title

World Bank income group

Country

Study design

Population size

Gender distribution (F/M) % Female

Funding source

2020

A Call to Action: Black/African American Women Surgeon Scientists, Where are They? [87]

High income

United States

Retrospective review

n = 123

 

Not reported

2020

A Report on the Representation of Women in Academic Plastic Surgery Leadership. [88]

High income

United States

Retrospective review

  

Not reported

2020

Gender and academic promotion of Canadian general surgeons: a cross-sectional study. [89]

High income

Canada

Cross-sectional analysis

n = 405

(111/294) 27%

Not reported

2020

Gender Disparities Among Burn Surgery Leadership. [90]

High income

United States

Cross-sectional analysis

n = 581

(58/523) 10%

No funding

2020

Gender Disparity Among Surgical Peer-Reviewed Literature. [91]

High income

United States

Retrospective review

  

Not reported

2020

Influence of gender on career expectations of oral and maxillofacial surgeons.[92]

Lower middle, upper middle and high income

Egypt

Jordan

Saudi Arabia

Questionnaire

n = 110

(40/70) 36%

Not reported

2020

Perceptions on gender disparity in surgery and surgical leadership: A multicenter mixed methods study. [93]

High income

United states

Mixed methods

n = 36

(14/22) 39%

No funding

2020

Gender disparities in academic vascular surgeons. [94]

High income

United States

Cross-sectional analysis

n = 951

(117/774) 19%

Not reported

2020

Gender disparity and sexual harassment in vascular surgery practices. [95]

High income

United States

Questionnaire

n = 149

(33/116) 22%

Not reported

2019

Barriers to careers identified by women in academic surgery: A grounded theory model. [21]

High income

United States

Semi-structured interviews

n = 15

100%

No funding

2019

Female Representation and Implicit Gender Bias at the 2017 American Society of Colon and Rectal Surgeons' Annual Scientific and Tripartite Meeting.[96]

High income

United States

Prospective observational study

n = 1532

100%

No funding

2019

Gender differences among surgical fellowship program directors.[97]

High income

United States

Cross-sectional analysis

n = 811

 

Not reported

2019

Is Gender Associated With Success in Academic Oral and Maxillofacial Surgery?[98]

High income

United States

Cross-sectional analysis

n = 306

(53/253) 17%

Not reported

2019

Military Medicine and the Academic Surgery Gender Gap. [99]

High income

United States

Cross-sectional analysis

n = 2125

(376/1749) 18%

Not reported

2019

Assessment of Gender Differences in Perceptions of Work–Life Integration Among Head and Neck Surgeons. [100]

High income

United States

Questionnaire

n = 261

(71/190) 27%

Not reported

2019

A woman's place is in theatre: women's perceptions and experiences of working in surgery from the Association of Surgeons of Great Britain and Ireland women in surgery working group. [24]

High income

United Kingdom

Ireland

Questionnaire

n = 81

100%

Not-for-profit sponsored

2019

Despite Growing Number of Women Surgeons, Authorship Gender Disparity in Orthopaedic Literature Persists Over 30 Years. [101]

High income

United States

Cross-sectional analysis

n = 6

 

Not reported 

2019

Editorial (Spring) Board? Gender Composition in High-impact General Surgery Journals Over 20 Years. [102]

High income

United States

Cross-sectional analysis

n = 10

 

Public-Sponsored

2019

Gender Disparity in Surgery: An Evaluation of Surgical Societies. [103]

High income

United States

Cross-sectional analysis

n = 587

(135/452) 23%

Not reported

2019

Gender representation in leadership roles in UK surgical societies. [3]

High income

United Kingdom

Cross-sectional analysis

n = 20,803

(2446/18,357) 12%

No funding

2019

Is there a gender bias in the advancement to SAGES leadership? [104]

High income

United States

Retrospective longitudinal analysis

n = 1546

(323/1223) 21%

Not reported

2019

Change Is Happening: An Evaluation of Gender Disparities in Academic Plastic Surgery. [105]

High income

United States

Cross-sectional analysis

n = 938

(186/752) 20%

No funding

2019

Gender disparities in academic rank achievement in neurosurgery: a critical assessment. [106]

High income

United States

Cross-sectional analysis

n = 841

(80/761) 10%

Not reported

2019

Gender Disparity in Leadership Positions of General Surgical Societies in North America, Europe, and Oceania. [20]

High income

United States Australia

New Zealand (Europe)Δ

Retrospective cross-sectional analysis

  

Not reported

2019

Practice patterns and work environments that influence gender inequality among academic surgeons. [107]

High income

United States

Retrospective cross-sectional analysis

n = 51

(10/41) 20%

No funding

2019

Female Neurosurgeons in Europe-On a Prevailing Glass Ceiling. [16]

Lower middle Upper middle and High income

22 Countries

Questionnaire

n = 116

100%

No funding

2018

Female Surgeons as Counter Stereotype: The Impact of Gender Perceptions on Trainee Evaluations of Physician Faculty. [108]

High income

United States

Cross-sectional analysis

n = 1066

(467/599) 44%

Not reported

2018

Organizational barriers to and facilitators for female surgeons' career progression: a systematic review. [109]

High income

United Kingdom

United States

Canada

Systematic review

  

No funding

2017

Discrimination against female surgeons is still alive: Where are the full professorships and chairs of departments? [110]

High income

United States

Systematic review

 

100%

Not reported

2017

E-WIN Project 2016: Evaluating the Current Gender Situation in Neurosurgery Across Europe-An Interactive, Multiple-Level Survey [17]

Lower middle Upper middle and High income

35 countries*

Questionnaire

n = 12,985

12%

Not reported

2017

Gender Differences in the Professional and Personal Lives of Plastic Surgeons [111]

High income

United States

Questionnaire

n = 757

(309/448) 41%

Not reported

2016

Gender Differences in Pediatric Orthopedics: What Are the Implications for the Future Workforce? [112]

High income

United States

Questionnaire

n = 62

(18/44) 29%

Not reported

2016

The erasure of gender in academic surgery: a qualitative study. [113]

High income

Canada

Qualitative interviews

n = 8

100%

Not reported

2015

Surgeons in Difficulty: An Exploration of Differences in Assistance-Seeking Behaviors between Male and Female Surgeons. [114]

High income

United States

Questionnaire

n = 192

(113/79) 59%

Not reported

2015

Women in surgery: factors deterring women from being surgeons in Zimbabwe. [27]

Lower middle income

Zimbabwe

Questionnaire

n = 159

(74/85) 46%

Not reported

2014

Gender inequality in career advancement for females in Japanese academic surgery. [115]

High income

Japan

Quantitative/evaluation study

n = 787

(132/655) 17%

Not reported

2013

Perceived gender-based barriers to careers in academic surgery. [116]

High income

United States

Questionnaire

n = 154

(70/84) 46%

Not reported

2011

Is there still a glass ceiling for women in academic surgery? [22]

High income

United States

Scoping review

 

100%

Not reported

2011

Under representation of women in surgery in Nigeria: by choice or by design?[25]

Lower middle income

Nigeria

Questionnaire

n = 105

100%

Not reported

2010

Women in surgery: a survey in Switzerland. [23]

High income

Switzerland

Questionnaire

n = 189

100%

No funding

2009

Practice patterns and career satisfaction of Canadian female general surgeons [117]

High income

Canada

Questionnaire

n = 85

100%

Not reported

2006

Challenges confronting female surgical leaders: Overcoming the barriers [26]

High income

United States

Semi-structure interviews

n = 10

100%

Not reported

2004

Women in academic general surgery.[118]

High income

United States

Questionnaire

n = 317

(149/168) 47%

Not Reported

2004

Professional satisfaction of women in surgery: results of a national study. [119]

High income

Austria

Questionnaire

n = 206

100%

Not-for-profit-sponsored

2001

Collective contributions of women to cardiothoracic surgery: a perspective review. [120]

High income

United States

Cross-sectional analysis

n = 84

100%

Not reported

2000

Perceived obstacles to career success for women in academic surgery. [121]

High income

United States

Questionnaire/systematic review

n = 54

(9/45) 17%

Not reported

1996

Women in oral and maxillofacial surgery: factors affecting career choices, attitudes, and practice characteristics. [122]

High income

United States

Questionnaire

n = 107

100%

Not reported

 

Residency and training

Year

Title

World Bank Income Group

Country

Study design

Population size

Gender distribution (M/F) % Female

Funding source

2020

Barriers to Women Entering Surgical Careers: A Global Study into Medical Student Perceptions. [18]

All levels

75 Countriesψ

Questionnaire

n = 639

(374/265) 59%

Not reported

2020

Sexual Harassment and Cardiothoracic Surgery: #UsToo? [15]

Unknown

Unknown

Questionnaire

n = 790

(185/591) 23%

Not reported

2020

Women Continue to Be Underrepresented in Surgery: A Study of AMA and ACGME Data from 2000 to 2016. [123]

High income

United States

Retrospective Review

  

Not Reported 

2020

Women in otolaryngology in Turkey: Insight of gender equality, career development and work–life balance. [29]

Upper middle income

Turkey

Questionnaire

n = 156

100%

No funding

2019

Paradox of meritocracy in surgical selection, and of variation in the attractiveness of individual specialties: to what extent are women still disadvantaged?[124]

High income

Australia

New Zealand

Cross-Sectional Analysis

n = 5288

 

Not reported 

2019

Gender Differences in Case Volume Among Ophthalmology Residents. [125]

High income

United States

Retrospective longitudinal analysis

n = 1271

(456/815) 36%

Private-sponsored

2019

Understanding the Barriers to Reporting Sexual Harassment in Surgical Training. [41]

High income

United States

Questionnaire

n = 270

(120/143) 44%

Not reported

2019

Why do women leave surgical training? A qualitative and feminist study. [46]

High income

Australia

New Zealand

Qualitative interviews

n = 12

100%

Not-for-profit-sponsored

2019

Assessing gender bias in qualitative evaluations of surgical residents. [126]

High income

United States

Qualitative analysis

n = 143

(51/92) 36%

Public sponsored

2019

Female Medical Student Retention in Neurosurgery: A Multifaceted Approach. [51]

High income

United States

Questionnaire

n = 104

100%

Not reported

2019

Gender Bias Experiences of Female Surgical Trainees. [43]

High income

United States

Mixed methods

n = 48

100%

University-sponsored

2018

A qualitative study on perceptions of surgical careers in Rwanda: A gender-based approach. [30]

Low income

Rwanda

Semi-structured interviews

n = 12

(6/6) 50%

No funding

2018

A qualitative study of gender differences in the experiences of general surgery trainees. [36]

High income

United States

Structured interviews

n = 42

(18/24) 43%

No Funding

2018

Burnout and gender in surgical training: A call to re-evaluate coping and dysfunction. [127]

High income

United States

National survey

n = 566

(288/278) 51%

No funding

2017

Does gender impact on female doctors ‘experiences in the training and practice of surgery? A single center study. [28]

Upper middle income

South Africa

Questionnaire

n = 32

100%

Not reported

2016

Understanding and Overcoming Implicit Gender Bias in Plastic Surgery. [35]

High income

United States

Systematic review

  

Not reported

2016

A Values Affirmation Intervention to Improve Female Residents' Surgical Performance. [49]

High income

United States

Randomized control trial

n = 93

(32/61) 35%

University-sponsored

2016

Exploring the Relationship Between Stereotype Perception and Residents' Well-Being. [37]

High income

United States

Correlation study

n = 384

(189/195) 49%

University-sponsored

2016

Medical School Experiences Shape Women Students' Interest in Orthopaedic Surgery. [38]

High income

United States United Kingdom

Systematic Review

  

Not reported

2016

Mentorship as Experienced by Women Surgeons in Japan. [52]

High income

Japan

Questionnaire

n = 55

100%

Not reported

2016

Women in academic surgery: why is the playing field still not level? [34]

High income

Canada

Questionnaire

n = 81

100%

No funding

2015

Gender differences in the acquisition of surgical skills: a systematic review. [48]

High income

United States

United Kingdom

Sweden

Canada

Denmark Switzerland

Systematic review

n = 2106

 

Not reported

2015

Perceptions of gender-based discrimination during surgical training and practice. [39]

High income

United States

Questionnaire

n = 334

100%

No funding

2013

Women in surgical residency training programs. [5]

High income

United States

Cross-Sectional Analysis

  

Not reported

2013

Gender-related perceptions of careers in surgery among new medical graduates: results of a cross-sectional study. [128]

High income

United Kingdom

Questionnaire

n = 208

(130/78) 63%

Not reported

2013

The only girl in the room: how paradigmatic trajectories deter female students from surgical careers [45]

High income

United Kingdom

Semi-structure interviews

n = 19

60%

University-sponsored

2011

Differences in final product of a bowel anastomosis of male and female novice surgeons. [47]

high income

United Kingdom

Non-randomized control trial

n = 36

(18/18) 50%

Not reported

2011

Women in surgery residency programs: evolving trends from a national perspective. [129]

High income

United States

Cross-sectional analysis

  

Not reported

2009

Burnout in Australasian Younger Fellows. [130]

High income

Australia

Questionnaire

n = 277

(52/225) 19%

Not-for-profit-sponsored

2009

Sex and the orthopaedic surgeon: a survey of patient, medical student and male orthopaedic surgeon attitudes towards female orthopaedic surgeons. [44]

High income

United Kingdom

Questionnaire

n = 561

(284/277) 51%

Not reported

2006

Women in surgery: do we really understand the deterrents? [42]

High income

United States

Questionnaire

n = 141

(90/51) 64%

Not reported

2005

The training needs and priorities of male and female surgeons and their trainees. [40]

High income

United States

Questionnaire

n = 4308

(1034/3274) 24%

Not reported

2005

Why are women deterred from general surgery training? [33]

High income

Canada

Questionnaire

n = 417

(314/103) 75%

Not-for-profit-sponsored

2002

Perceptions of women medical students and their influence on career choice. [50]

High income

United States

Questionnaire

n = 305

100%

Not reported

2000

The influence of gender and specialty on reporting of abusive and discriminatory behaviour by medical students, residents and physician teachers.[31]

High income

Canada

Questionnaire

n = 569

(212/357) 38%

Not reported

2000

A surgical career? The views of junior women doctors. [131]

High income

United Kingdom

Structured interviews

n = 24

(12/12) 50%

Not reported

1996

Do Canadian female surgeons feel discriminated against as women? [32]

High income

Canada

Questionnaire

n = 419

100%

Not-for-profit-sponsored

 

Family and work–life balance

Year

Title

World Bank Income Group

Country

Study design

Population size

Gender distribution (M/F) % Female

Funding source

2020

Surgeon Experience with Parental Leave Policies Varies Based on Practice Setting. [132]

High income

United States

Questionnaire

n = 477

100%

No funding

2019

Surgical trainees' experience of pregnancy, maternity and paternity leave: a cross-sectional study. [61]

High income

United Kingdom

Questionnaire

n = 876

(555/321) 63%

No funding

2019

An Analysis of Differences in the Number of Children for Female and Male Plastic Surgeons [59]

High income

United States

Questionnaire

n = 757

309/448 41%

No funding

2019

Policies and practice regarding pregnancy and maternity leave: An international survey. [19]

Lower middle

Upper middle

High income

United States

United Kingdom

Canada

Nigeria

Australia

China

Sweden

Ireland

Israel

Finland

Italy

South Africa°

Questionnaire

n = 1111

100%

No funding

2018

Factors Associated With Residency and Career Dissatisfaction in Childbearing Surgical Residents. [55]

High income

United States

Questionnaire

n = 347

100%

Not reported

2018

Pregnancy and Motherhood During Surgical Training. [69]

High income

United States

Questionnaire

n = 342

100%

Not reported

2018

Women in surgery: A longer term follow-up. [133]

High income

United States

Cross-Sectional Analysis

n = 108

(26/82) 24%

Not-for-profited sponsored

2018

Female trainees believe that having children will negatively impact their careers: results of a quantitative survey of trainees at an academic medical center [67]

High income

United States

Questionnaire

n = 435

261/174 60%

University-sponsored

2018

Perspectives of pregnancy and motherhood among general surgery residents: A qualitative analysis [134]

High income

United States

Questionnaire

n = 219

100%

Not reported

2017

WOMEN IN SURGERY—an overview of the evolving trends in Nigeria. [53]

Lower middle income

Nigeria

Questionnaire

n = 60

100%

Not reported

2017

Gender differences in academic surgery, work–life balance, and satisfaction. [73]

High income

United States

Questionnaire

n = 243

(76/167) 31.3%

Not reported

2017

Career intentions of female surgeons in German liver transplant centers considering family and lifestyle priorities. [135]

High income

Germany

Questionnaire

n = 81

100%

Not reported

2016

Factors that Can Promote or Impede the Advancement of Women as Leaders in Surgery: Results from an International Survey. [76]

High income

United States

Japan

Finland

Hong Kong (SAR, China)

Questionnaire

n = 225

100%

Not reported

2016

Suturing the gender gap: Income, marriage, and parenthood among Japanese Surgeons. [136]

High income

Japan

Questionnaire

n = 1938

(846/1092) 43.7%

Not reported

2016

Biographic Characteristics and Factors Perceived as Affecting Female and Male Careers in Academic Surgery: The Tenured Gender Battle to Make It to the Top. [70]

High income

Germany

Questionnaire

n = 133

(63/70) 47.4%

No funding

2016

Why Do Women Choose to Enter Academic Oral and Maxillofacial Surgery? [58]

High income

United States

Questionnaire

n = 31

100%

Not reported

2016

Working Conditions and Lifestyle of Female Surgeons Affiliated to the Japan Neurosurgical Society: Findings of Individual and Institutional Surveys. [63]

High income

Japan

Questionnaire

n = 224

100%

Not reported

2015

'You become a man in a man's world': is there discursive space for women in surgery? [137]

High income

United Kingdom

Semi-structured interviews

n = 15

100%

No funding

2014

Does a surgical career affect a woman's childbearing and fertility? A report on pregnancy and fertility trends among female surgeons. [68]

High income

United States

Questionnaire

n = 1021

100%

Not reported

2014

Pregnancy-Related Attrition in General Surgery [60]

High income

United States

Retrospective Review

n = 85

(36/49) 42%

Not reported

2014

Work–life balance of female versus male surgeons in Hong Kong based on findings of a questionnaire designed by a Japanese surgeon. [71]

High income

Hong Kong (SAR, China)

Questionnaire

n = 114

(37/77) 32.5%

Not reported

2012

Childbearing and pregnancy characteristics of female orthopaedic surgeons. [66]

High income

United States

Questionnaire

n = 1021

100%

No funding

2012

Pregnancy among women surgeons: trends over time. [56]

High income

United States

Questionnaire

n = 1950

100%

Not-for-profit-sponsored

2011

Relationship between work–home conflicts and burnout among American surgeons: a comparison by sex. [65]

High income

United States

Questionnaire

n = 7858

(1043/6815) 13%

Not-for-profit-sponsored

2011

Female surgeons' mentoring experiences and success in an academic career in Switzerland. [75]

High income

Switzerland

National Survey

n = 189

100%

Private-sponsored

2010

Women surgeons in Hong Kong [138]

High income

Hong Kong (SAR, China)

Questionnaire

n = 172

(58/114) 34%

Not reported

2010

Career satisfaction of women in surgery: perceptions, factors, and strategies. [139]

High income

United States

Semi-structured interviews

n = 18

(12/6) 66.7%

Not reported

2009

Women surgeons in the new millennium. [57]

High income

United States

Questionnaire

n = 895

(178/698) 20%

Not-For-profit-sponsored

2009

Gender and Specialty Influences on Personal and Professional Life Among Trainees. [140]

High income

Ireland

Questionnaire

n = 460

(300/160) 65%

Not reported

2004

The gender gap in a surgical subspecialty—Analysis of career and lifestyle factors [141]

High income

United States

Questionnaire

n = 673

37%

Not-for-profit-sponsored

2003

Career satisfaction and surgical practice patterns among female ophthalmologists [74]

High income

Canada

Questionnaire

n = 137

72/65 45%

Not reported

2001

Childbearing and childcare in surgery. [54]

High income

United States

Questionnaire

n = 42

(20/22) 47.6%

Not reported

1998

Characteristics of women surgeons in the United States. [142]

High income

United States

Questionnaire

n = 4445

100%

Not reported

1997

Plastic surgeons: a gender comparison. [72]

High income

United States

Questionnaire

n = 432

(216/216) 50%

Not reported

1994

Women surgeons: career and lifestyle comparisons among surgical subspecialties. [64]

High income

Canada

Questionnaire

n = 419

100%

Not-for-profit-sponsored

1993

Women surgeons. Results of the Canadian Population Study. [62]

High income

Canada

Questionnaire

n = 419

100%

Not reported

 

Other (pay, etc.)

Year

Title

World Bank Income Group

Country

Study design

Population size

Gender distribution (F/M)% Female

Funding source

2020

Gender Disparity in Trauma Surgery: Compensation, Practice Patterns, Personal Life, and Wellness. [143]

High income

United States

Questionnaire

n = 497

105/356 21%

Not reported

2020

Gender and compensation among surgical specialties in the Veterans Health Administration. [144]

High income

United States

Cross-sectional analysis

n = 1993

458/1535 23%

Not reported

2020

The Role of Gender, Academic Affiliation, and Subspecialty in Relation to Industry Payments to Orthopaedic Surgeons [145]

High income

United States

Retrospective Analysis

n = 22,352

1299/21,053 6%

No funding

2020

Men Receive Three Times More Industry Payments than Women Academic Orthopaedic Surgeons, Even After Controlling for Confounding Variables. [146]

High income

United States

Retrospective cross-sectional analysis

n = 2893

316/2577 11%

Not reported

2019

Gender Equity in Humanitarian Surgical Outreach: A Decade of Volunteer Surgeons.[147]

High income

United States

Questionnaire

n = 227

(139/88) 61%

Not reported

2019

Women surgeons and the emergence of acute care surgery programs. [148]

High income

United States

National survey

n = 1546

 

Public-sponsored

2019

Sex-Based Disparities in the Hourly Earnings of Surgeons in the Fee-for-Service System in Ontario, Canada.[149]

High income

Canada

Cross-sectional analysis

n = 3275

 

Private-sponsored

2019

The Effect of Sex on Orthopaedic Surgeon Income. [81]

High income

United States

Questionnaire

n = 4335

302/4033 7%

No funding

2018

The surgical personality: does it exist? [150]

High income

United Kingdom

Questionnaire

n = 599

(256/341) 43%

Not reported

2018

The ties that bind: what's in a title? [151]

High income

Australia

New Zealand

Retrospective review

n = 6143

(702/5441) 11.4%

Not reported

2018

A Structured Compensation Plan Improves But Does Not Erase the Sex Pay Gap in Surgery. [152]

High income

United States

Questionnaire

n = 44

(11/33) 25%

Not reported

2018

Assessing the domino effect: Female physician industry payments fall short, parallel gender inequalities in medicine. [153]

High income

United States

Cross-sectional analysis

n = 31,297

(4511/26,786) 14%

No funding

2018

Equal Pay for Equal Work: Medicare Procedure Volume and Reimbursement for Male and Female Surgeons Performing Total Knee and Total Hip Arthroplasty. [154]

High income

United States

Cross-sectional analysis

n = 20,546

(906/19,640) 4.4%

No funding

2018

Can the surgeon live his whole life? Analysis of the risk of death related to the profession. [77]

High income

Poland

Cross-sectional analysis

n = 6496

 

Not reported

2015

The Nonwhite Woman Surgeon: A Rare Species. [155]

High income

United States

Questionnaire

n = 194

(81/113) 42%

Not reported

2015

Cancer Prevalence among a Cross-sectional Survey of Female Orthopedic, Urology, and Plastic Surgeons in the United States. [79]

High income

United States

National survey

n = 1023

100%

Not reported

2014

The ergonomics of women in surgery.[80]

High income

United States

Questionnaire

n = 314

(54/260) 17.2%

Not reported

2014

Perceptions of surgeons: what characteristics do women surgeons prefer in a colleague? [156]

High income

United States

Questionnaire

n = 212

100%

University-sponsored

2005

Female surgeons' alcohol use: a study of a national sample of Norwegian doctors. [78]

High income

Norway

Questionnaire

n = 1385

(347/1038) 25%

Not reported

  1. Blank boxes indicate that data could not be found or did not apply
  2. * Did not analyze data according to the 35 Countries in this study: Albania, Austria, Belgium, Bosnia-Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Israel, Italy, Kazakhstan, Kosovo, Latvia, Lithuania, Moldova, Netherlands, Poland, Portugal, Romania, Russia, Serbia, Slovakia, Spain, Sweden, Switzerland, Turkey, Ukraine, and United Kingdom
  3. ΔDid not analyze data according to country
  4. Did not analyze data according to the 22 Countries in this study: Austria, Belgium, Croatia, Czech Republic, Estonia, France, Germany, Greece, Ireland, Italy, Latvia, Netherlands, Poland, Portugal, Russia, Serbia, Spain, Sweden, Switzerland, Turkey, Ukraine, and United Kingdom
  5. ψIncluded countries were indicated in a map in the article, therefore reliable data on exact countries could not be completely determined
  6. Only these 3 countries were listed: United States, Canada and Mexico. The rest of the study population was designated by continent only. A complete list could not be determined for this study as results did not analyze differences between countries
  7. °Respondents from 53 countries participated in this study, but the authors only reported countries with > 10 responses in their paper