1. The First Department of Internal Medicine; Gifu University School of Medicine; Gifu
2. Division of Hepatobiliary and Pancreatic Disease; Department of Internal Medicine; Hyogo College of Medicine; Hyogo
3. Medical Education Center; Aichi Medical University School of Medicine; Aichi
4. Department of Internal Medicine; Saga Medical School; Saga University; Saga
5. Department of Surgery; Kansai Medical University; Osaka
6. Center for Nutrition Support and Infection Control; Gifu University Hospital; Gifu; Japan