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Aalfs CM, Smets EM, de Haes JC, Leschot NJ.Aalfs CM, et al. Among authors: smets em.Ned Tijdschr Geneeskd. 2001 Aug 18;145(33):1577-81.Ned Tijdschr Geneeskd. 2001.PMID: 11534373Review.Dutch.