https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-21
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-18
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-19
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-23
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-20
https://human-resources-health.biomedcentral.com/articles/10.1186/1478-4491-12-22