1. Department of Community Medicine, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan
2. Department of Emergency and Critical Medicine, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan
3. Department of General Medicine, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan
4. General Medicine Center, Shimane University Hospital, Izumo, Shimane, Japan