1. Department of Pediatrics, School of Medicine, Shimane University, Shimane, Japan
2. Department of Digestive and General Surgery, School of Medicine, Shimane University, Shimane, Japan
3. Department of Pathology, Shimane University Hospital, Shimane, Japan
4. Department of Pediatric Hepatology and Gastroenterology, Saiseikai Yokohama City Tobu Hospital, Kanagawa, Japan
5. Department of Medical English Education, School of Medicine, Shimane University, Shimane, Japan