1. Ulcerative colitis;Jewel,1998
2. Inflammatory bowel disease;Brown;Primary Care,1999
3. Crohn's disease;Kornbluth,1998
4. Epidemiology and the natural course of inflammatory bowel disease;Andres;Gastroenterol. Clin. N. Am.,1999
5. Crohn's Colitis Foundation of America Library;Facts about the epidemiology of inflammatory bowel disease,1999