World Literature ReviewJohnson, David, MD, FACGAmerican Journal of Gastroenterology: May 2000 - Volume 95 - Issue 5 - p 1355–1360 doi: 10.1111/j.1572-0241.2000.90000002.x WORLD LITERATURE REVIEW: PDF Only Buy Article MetricsMetrics © The American College of Gastroenterology 2000. All Rights Reserved.