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van der Zwan CW, Plantinga AD, Rümke HC, Conyn-van Spaendonck MA.van der Zwan CW, et al.Ned Tijdschr Geneeskd. 1994 Nov 26;138(48):2390-5.Ned Tijdschr Geneeskd. 1994.PMID: 7990986Dutch.