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van der Pol WL, Kuijper EJ, Koene HR, de Haas M, Sanders EA, van de Winkel JG.van der Pol WL, et al. Among authors: sanders ea.Ned Tijdschr Geneeskd. 1998 Feb 14;142(7):340-5.Ned Tijdschr Geneeskd. 1998.PMID: 9562739Review.Dutch.