Lewin, Weinstein, and Riddell's gastrointestinal pathology and its clinical implications / [edited by] Robert Riddell, MD,FRCPC, Professor of Laboratory Medicine and Pathobiology, University of Toronto, Mount Sinai Hospital, Toronto, Ontario, Canada ; Dhanpat Jain, MD, Professor of Pathology, Director, Program in Gastrointestinal anfd Liver Pathology, Department of Pathology, Yale University School of Medocine, New Haven, Connecticut, USA ; Clinical editors, Charles N. Bernstein, MD, Professor of Medicine, University of Manitoba, Head, Section of Gastroenterology, Director, University of Manitoba of IBD Clinical and Research Centre, Bingham Chair in Gastroenterology, Winnipeg, Manitoba, Canada ; Sushovan Guha, PhD, Associate Professor and Director of Research, Division of Gastroenterology, Hepatology, and Nutrition, Department of Internal Medicine, The University of Texas Medical School and Health Science Center at Houston, Houston, Texas, USA.