1. Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan
2. Department of Endoscopy, Aichi Cancer Center Hospital, Nagoya, Japan
3. Department of Medical Hepatology, Institute of Liver and Biliary Sciences, Delhi, India
4. Department of Gastrointestinal Surgery, Aichi Cancer Center Hospital, Nagoya, Japan
5. Department of Gastroenterology, Nagoya University Graduate School of Medicine, Nagoya, Japan