https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0259-0
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https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0242-9
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https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0253-6
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0249-2
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0256-3
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0244-7
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0251-8
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0254-5
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0241-x
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0257-2
https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0252-7