Gastroenterological endoscopy / [edited by] Michael B. Wallace, MD, Professor of Medicine, Division of Gastroenterology and Hepatology, Mayo Clinic, Jacksonville, FL, USA, Paul Fockens, MD, Professor and Chair, Department of Gastroenterology and Hepatology, Academic Medical Center, University of Amsterdam, Amsterdam,The Netherlands, Joseph Jao Yiu Sung, MD, PhD, Mok Hing Yiu Professor of Medicine and Director, Institute of Digestive Diseases, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong ; associate editors, Todd H. Baron, Nicholas J. Shaheen, Michael John Bourke, D. Nageshwar Reddy, Lauren B. Gerson ; with contributions by J©ơrgen Hochberger [and seventy-eight others].