https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0331-9 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0339-1 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0332-8 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0328-4 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0333-7 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0340-8 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0336-4 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0324-8 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0330-x https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0315-9 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0334-6 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0337-3 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0325-7 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0335-5 https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0342-6