The National Cooperative Crohn's Disease Study.
D001379:Azathioprine / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D003424:Crohn Disease / Q000175:diagnosis / Q000188:drug therapy*; D006801:Humans; D010919:Placebos; D011241:Prednisone / Q000627:therapeutic use; D011379:Prognosis; D012460:Sulfasalazine / Q000627:therapeutic use
D010919:Placebos; D012460:Sulfasalazine; D001379:Azathioprine; D011241:Prednisone