Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Suita, Japan. Department of Hepatobiliary and Pancreatic Oncology, Osaka International Cancer Institute, Osaka, Japan. Department of Gastroenterology and Hepatology, Osaka Police Hospital, Osaka, Japan. Department of Gastroenterology and Hepatology, Minoh City Hospital, Minoh, Japan. Department of Gastroenterology and Hepatology, Kansai Rosai Hospital, Amagasaki, Japan. Department of Gastroenterology and Hepatology, National Hospital Organization Osaka National Hospital, Osaka, Japan. Department of Gastroenterology and Hepatology, Osaka General Medical Center, Osaka, Japan. Department of Gastroenterology and Hepatology, Toyonaka Municipal Hospital, Toyonaka, Japan. Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Suita, Japan; takehara@gh.med.osaka-u.ac.jp.