649 A Randomized Placebo-Controlled Trial of Abatacept for Moderately-to-Severely Active Crohn's Disease (CD) von Hanauer, Stephen B, Sandborn, William J, Sands, Bruce E, Rutgeerts, Paul J, Panaccione, Remo, Bressler, Brian, Whiteside, Marvilyn A, Swanink, René, Aranda, Richard, Luo, Allison

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