1Department of Surgery; Kitakyushu Municipal Yahata Hospital; 4-18-1 Nishihon-machi, Yahatahigashi-ku Kitakyushu Fukuoka 805-8534 Japan
2Department of Surgery, Teikyo University School of Medicine, Tokyo, Japan
3Section of Hepatobiliary and Pancreatic Surgery Washington University in Saint Louis School of Medicine Saint Louis MO USA
4Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA
5Department of Surgery, Indiana University School of Medicine, Indianapolis IN USA
6Clinical Surgery, The University of Edinburgh, Edinburgh, UK
7Department of Surgery, University of Heidelberg, Heidelberg, Germany
8Clinical Research Center Kaken Hospital, International University of Health and Welfare, Ichikawa, Japan
9Department of Surgical Oncology and Gastroenterological Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan
10Department of Surgery, Institute of Gastroenterology, Tokyo Women’s Medical University, Tokyo, Japan
11Department of Gastroenterological Surgery, Fukuoka University School of Medicine, Fukuoka, Japan
12Department of Emergency and Critical Care Medicine, Ichinomiya Municipal Hospital, Ichinomiya, Japan
13Center for Clinical Infectious Diseases; Jichi Medical University; Tochigi Japan
14Department of Surgery, Toho University Medical Center Ohashi Hospital, Tokyo, Japan
15Department of Gastroenterology, Ogaki Municipal Hospital, Ogaki, Japan
16General Internal Medicine, Nagoya Daini Red Cross Hospital, Nagoya, Japan
17Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong
18Department of Internal Medicine, Asan Medical Center, University of Ulsan, Seoul, Korea