https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-54
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-49
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-50
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-52
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-51
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-53
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-55