1. Department of Cardiology, Keio University School of Medicine, Tokyo 160-0016, Japan.
2. Department of Cardiovascular Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan.
3. Department of Rehabilitation Sciences, Graduate School of Medical Sciences, Kitasato University, Kanagawa 252-0373, Japan.
4. Department of Advanced Cardiology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan.
5. International University of Health and Welfare, Tokyo 107-8402, Japan.
6. Department of Frontier Cardiovascular Science, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan.