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A Randomized, Double-Blind, Controlled Withdrawal Trial in Crohn’s Disease Patients in Long-term Remission on Azathioprine[J] . Marc Lémann,Jean-Yves Mary,Jean-Frédéric Colombel,Bernard Duclos,Jean-Claude Soule,Eric Lerebours,Robert Modigliani,Yoram Bouhnik.Gastroenterology . 2005 (7)
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Postoperative maintenance of Crohn’s disease remission with 6-mercaptopurine, mesalamine, or placebo: A 2-year trial[J] . Stephen B. Hanauer,Burton I. Korelitz,Paul Rutgeerts,Mark A. Peppercorn,Ronald A. Thisted,Russell D. Cohen,Daniel H. Present.Gastroenterology . 2004 (3)