1. Greenstein AJ, Janowitz HD, Sachar DB: The extraintestinal complications of Crohn's disease and ulcerative colitis: A study of 700 patients. Medicine (Baltimore) 55:401?412, 1976
2. Rakfin GB, Watts HD, Melnyk CS, Kelly ML: National cooperative Crohn's disease study: Extraintestinal manifestations and perianal complications. Gastroenterology 77: 914?920, 1977
3. Sleisenger MH, Fordtran JS Gastrointestinal Disease: Pathophysiology, Diagnosis, Management. 3rd ed. Philadelphia, WB Saunders, 1983
4. Allan RN, Keighley MRB, Alexander-Williams J, Hawkins C: Inflammatory Bowel Diseases. Edinburgh, Churchill Livingstone, 1983
5. Mallory, A, Kern F: Drug-induced pancreatitis: A critical review. Gastroenterology 78:813?820, 1980