ผู้เขียน: Gary R. May

Elijah Dixon MD, BSc, MSc (Epi), FRCSC, FACSAssociate Professor of Surgery, Oncology, and Community Health Sciences, Service Chief, Hepatobiliary and Pancreatic Surgery, University of Calgary, Foothills Medical Centre, Division of General Surgery, Calgary, Alberta, Canada Charles M. Vollmer Jr., MD, FACSAssociate Professor of Surgery, Hospital of the University of Pennsylvania, University of Pennsylvania, Perelman School of Medicine, Department of Surgery, Philadelphia, PA, USA Gary R. May, MD, FRCPC, FASGEActing Head, Associate Professor of Medicine, St. Michael”s Hospital, Division of Gastroenterology, University of Toronto, Toronto, Ontario, Canada