3Jiang Li, Xia bing Li, Jin MD, et al. Risk Factors for Uleerative Colitis in a Chinese Population: An Age-matched and Sex-matched Case-control Study[J]. Journal of Clinical Gastrnenterology, 2007,41 (3) : 280-284.
4Sands BE. Inflammatory bowel disease: past, present, and future[J]. Gastroenterol, 2007,42:16-25.