Hayashi Clinic - Department of Gastroenterology and Internal Medicine, Kindai University - Department of Gastroenterology and Hepatology, Kindai University - Department of Radiology, University of Tokyo - Department of Gastroenterology, Fukui Prefectural Hospital - Department of Gastroenterology, Kansai Rosai Hospital - Department of Gastroenterology and Hepatology, Osaka City University - Department of Gastroenterology, Ishikawa Prefectural Central Hospital - Department of Gastroenterology, Tonan Hospital - Department of Gastroenterology, Japanese Foundation for Cancer Research - Department of Gastroenterology, Suita Municipal Hospital - Department of Gastroenterology and Hepatology, Osaka Rosai Hospital - Department of Gastroenterology and Hepatology, Osaka General Medical Center - Department of Gastroenterology and Hepatology, Fukushima Medical University - Department of Gastroenterology, Hyogo Cancer Center - Department of Gastroenterological Oncology, National Hospital Organization Shikoku Cancer Center, Tane General Hospital - Department of Gastroenterology, Japanese Red Cross Medical Center, National Hospital Organization Kure Medical Center - Department of Gastroenterology, Nagoya City University - Department of Gastroenterology and Metabolism, Toho University - Division of Gastroenterology and Hepatology, Osaka International Cancer Institute - Department of Hepatobiliary and Pancreatic Oncology, Gifu University - First Department of Internal Medicine, Toyonaka Municipal Hospital - Department of Gastroenterology, Juntendo University - Department of Gastroenterology and Toyonaka Municipal Hospital - Department of Gastroenterology