https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0366-y
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0385-8
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0345-3
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0357-z
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0384-9
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0383-x
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0381-z
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0356-0
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0382-y
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0379-6