作者: Christopher B. Williams

Adam Haycock, Consultant Physician & Gastroenterologist, St Mark”s Hospital for Colorectal and Intestinal Disorders, London, UK Jonathan Cohen, Clinical Professor of Medicine, New York University School of Medicine, New York, USA Brian P. Saunders, Consultant Gastroenterologist, St Mark”s Hospital for Colorectal and Intestinal Disorders, London, UK Peter B. Cotton, Professor of Medicine, Medical University of South Carolina, Charleston, USA Christopher B. Williams, Honorary Physician, St Mark”s Hospital for Colorectal and Intestinal Disorders, London, UK