1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
2. Department of Biochemistry, The Jikei University School of Medicine, Tokyo, Japan
3. Project Research Units, Research Center for Medical Science, The Jikei University School of Medicine, Tokyo, Japan
4. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan