1. Center for Rehabilitation, Showa University Fujigaoka Rehabilitation Hospital, Yokohama, Japan
2. Showa University Graduate School of Health Sciences, Yokohama, Japan
3. Division of Cardiology, Department of Internal Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
4. Division of Cardiology, Showa University Fujigaoka Rehabilitation Hospital, Yokohama, Japan
5. Juntendo University Faculty of Health Science, Tokyo, Japan
6. Division of Cardiology, Department of Medicine, Showa University Hospital, Tokyo, Japan