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Kara MA, Bergman JJ, Tytgat GN.Kara MA, et al. Among authors: tytgat gn.Gastrointest Endosc Clin N Am. 2003 Jul;13(3):513-33, viii. doi: 10.1016/s1052-5157(03)00043-6.Gastrointest Endosc Clin N Am. 2003.PMID: 14629107Review.