https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0452-9
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0448-5
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0450-y
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0454-7
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0451-x
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0458-3
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0449-4
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0460-9
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-016-0456-5