1FAUBION,WA JR,LOFTUS,et al.The natural history of corticosteroid therapy for inflammatory bowel disease:a population-based study[J].Gastroenterology,2001,121:255.
2NIELSEN OH,VAINER B,RASK-MADSEN J.Review article:the treatment of inflammatory bowel disease with 6-mercaptopurine or azathioprine[J].Aliment Pharmacol Ther,2001,15:1699.
3HAWTHORNE AB,LOGAN RF,HAWKEY CJ,et al.Ran-domized controlled trial of azathioprine withdrawal in ulcerative colitis[J].BMJ,1992,305:20.
4ROSENBERG JL,WALL AJ,LEVIN B,et al.A controlled trial of azathioprine in the management of chronic ulcerative colitis[J].Gastroenterology,1975,69:96.
5SOOD A,MIDHA V,SOOD N,et al.Role of azathioprine in severe ulcerative colitis:one-year,placebo-controlled,randomized trial[J].Indian J Gastroenterol,2000,19:14.
6FRASER AG,ORCHARD TR,JEWELL DP.The efficacy of azathioprine for the treatment of inflammatory bowel disease:a 30 year review[J].Gut,2002,50:485.
7LOBEL EZ,KORELITZ BI,XUEREB MA,et al.A search for the optimal duration of treatment with 6-mercaptopurine for ulcerative colitis[J].Am J Gastroenterol,2004,99:462.
8GEORGE J,PRESENT DH,POU R,et al.The long-term outcome of ulcerative colitis treated with 6-mercaptopurine[J].Am J Gastroenterol,1996,91:1711.
9ADLER DJ,KORELITZ BI.The therapeutic efficacy of 6-mercaptopurine in refratory ulcerative colitis[J].Am J Gastroenterol,1990,85:717.
10SANDBORN WJ,TREMAINE WJ,WOLF DC,et al.Lack of effect of intravenous administration on time to respond to azathioprine for steroid-treated Crohn's disease.North American Azathioprine Study Group[J].Gastroenterology,1999,117:527.