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van Wijk RM, van Vlimmeren LA, Groothuis-Oudshoorn CG, Van der Ploeg CP, Ijzerman MJ, Boere-Boonekamp MM.van Wijk RM, et al.BMJ. 2014 May 1;348:g2741. doi: 10.1136/bmj.g2741.BMJ. 2014.PMID: 24784879Free PMC article.Clinical Trial.