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Portielje JE, van der Werf SD, Mutsaers JA, Lohle PN, Puylaert JB.Portielje JE, et al. Among authors: mutsaers ja.Ned Tijdschr Geneeskd. 1997 Jan 11;141(2):89-93.Ned Tijdschr Geneeskd. 1997.PMID: 9036353Dutch.