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Frederiksen CA, Juhl-Olsen P, Nielsen DG, Eika B, Sloth E.Frederiksen CA, et al.BMC Med Educ. 2012 Aug 3;12:65. doi: 10.1186/1472-6920-12-65.BMC Med Educ. 2012.PMID: 22863138Free PMC article.