1. Department of Human Resources Development for General Practitioner, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan
2. Department of Emergency Medicine, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan
3. Department of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan
4. General Medicine Center, Shimane University Hospital, Izumo, Shimane, Japan