https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0293-y
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0291-0
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0295-9
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0281-2
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0286-x
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0292-z
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0283-0
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0290-1