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Groot A, Bots ML, Rutten FH, den Ruijter HM, Numans ME, Vaartjes I.Groot A, et al. Among authors: rutten fh.Br J Gen Pract. 2015 Jan;65(630):e1-8. doi: 10.3399/bjgp15X683089.Br J Gen Pract. 2015.PMID: 25548311Free PMC article.