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Ekkelenkamp VE, Koch AD, Haringsma J, Kuipers EJ, De Man RA.Ekkelenkamp VE, et al. Among authors: koch ad.Perspect Med Educ. 2014 Jan;3(1):31-40. doi: 10.1007/s40037-013-0099-3.Perspect Med Educ. 2014.PMID: 24307400Free PMC article.