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Langendijk PN, Zuurmond WW, van Apeldoorn HA, van Loenen AC, de Lange JJ.Langendijk PN, et al. Among authors: zuurmond ww.Ned Tijdschr Geneeskd. 1993 Mar 6;137(10):500-3.Ned Tijdschr Geneeskd. 1993.PMID: 8455741Dutch.