Reference
- Friedman LS, Peterson WL. Peptic ulcer and related disorders. In: Fauci AS, Braunwald E, Isselbacher KJ, et al, eds. Harrison's principles of internal medicine. 14th ed. New York: McGraw-Hill, 1998: 1599–603
Reference
- Anand BS, Graham DY. Ulcer and gastritis. Endoscopy 1999; 31(2): 215–25