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van der Kallen BF, Rijpkema G, van Erning LJ, Merx JL, Horstink MW, Thijssen HO.van der Kallen BF, et al. Among authors: thijssen ho.Ned Tijdschr Geneeskd. 1996 Feb 3;140(5):248-54.Ned Tijdschr Geneeskd. 1996.PMID: 8643131Dutch.