1. Department of Gastroenterology and Hepatology; Osaka University Graduate School of Medicine; Suita Japan
2. Department of Gastroenterology and Hepatology; Osaka General Medical Center; Osaka Japan
3. Department of Gastroenterology and Hepatology, National Hospital Organization; Osaka National Hospital; Osaka Japan
4. Department of Hepatobiliary and Pancreatic Oncology; Osaka International Cancer Institute; Osaka Japan
5. Ikeda Municipal Hospital; Ikeda Japan