1. Department of Internal Medicine II, Faculty of Medicine, University of Yamanashi, Japan
2. Department of Cardiology, Fujieda Municipal General Hospital, Japan
3. Department of Internal Medicine, Yamanashi Prefectural Central Hospital, Japan
4. Department of Cardiology, Kofu Municipal Hospital, Japan
5. Department of Cardiology, Kofu Jonan Hospital, Japan
6. Department of Cardiology, Yamanashi Kosei Hospital, Japan