1. Department of Cardiovascular Medicine, St. Luke’s International Hospital, Tokyo 104-8560, Japan
2. Department of Cardiology, Keio University School of Medicine, Tokyo 108-8345, Japan
3. Department of Cardiovascular Medicine, Kyorin University Faculty of Medicine, Tokyo 181-8611, Japan
4. Department of Cardiology, National Defense Medical College, Tokorozawa 359-8513, Japan
5. Department of Cardiology, International Medical Center, Saitama Medical University, Saitama 350-1298, Japan
6. Department of Cardiology, Sakakibara Heart Institute, Tokyo 183-0003, Japan