| Affiliation: | Center for Diagnostic and Therapeutic Endoscopy, School of Medicine, Keio University, Tokyo, Japan; Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan; Department of Tropical Medicine and Parasitology, School of Medicine, Keio University, Tokyo, Japan; Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan; Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan; Center for Diagnostic and Therapeutic Endoscopy, School of Medicine, Keio University, Tokyo, Japan |
