1. Department of Emergency and Critical Care Medicine, Jichi Medical University, Shimotsuke, Tochigi, Japan
2. Department of Emergency and Critical Care Medicine, Jichi Medical University, Shimotsuke-shi, Tochigi, Japan
3. Department of Surgery, Division of Gastroenterological, General and Transplant Surgery, Jichi Medical University, Shimotsuke, Tochigi, Japan
4. Department of Radiology, Jichi Medical University, Shimotsuke, Tochigi, Japan