https://human-resources-health.biomedcentral.com/articles/10.1186/s12960-019-0349-5
https://human-resources-health.biomedcentral.com/articles/10.1186/s12960-019-0348-6
https://human-resources-health.biomedcentral.com/articles/10.1186/s12960-019-0346-8
https://human-resources-health.biomedcentral.com/articles/10.1186/s12960-019-0353-9
https://human-resources-health.biomedcentral.com/articles/10.1186/s12960-019-0347-7