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Nieuwenhuis EJ, Castelijns JA, Pijpers R, van den Brekel MW, Brakenhoff RH, van der Waal I, Snow GB, Leemans CR.Nieuwenhuis EJ, et al. Among authors: pijpers r.Head Neck. 2002 Mar;24(3):282-9. doi: 10.1002/hed.10018.Head Neck. 2002.PMID: 11891961
Terwisscha Van Scheltinga SE, Den Boer FC, Pijpers R, Meyer GA, Engel AF, Silvis R, Meijer S, van der Sijp JR.Terwisscha Van Scheltinga SE, et al. Among authors: pijpers r.Scand J Gastroenterol Suppl. 2006;(243):153-7. doi: 10.1080/00365520600664524.Scand J Gastroenterol Suppl. 2006.PMID: 16782635