https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0260-7
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https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0277-y
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https://bmcfampract.biomedcentral.com/articles/10.1186/s12875-015-0274-1