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Kuipers EJ, Gracia-Casanova M, Peña AS, Pals G, Van Kamp G, Kok A, Kurz-Pohlmann E, Pels NF, Meuwissen SG.Kuipers EJ, et al.Scand J Gastroenterol. 1993 May;28(5):433-7. doi: 10.3109/00365529309098245.Scand J Gastroenterol. 1993.PMID: 8511504