1. Department of Cardiology, Juntendo University Graduate School of Medicine, Japan
2. Department of Cardiology, Institute of Sasaki Foundation, Kyoundo Hospital, Japan
3. Department of Orthopaedic Surgery, Juntendo University Graduate School of Medicine, Japan
4. Department of General Medicine, Juntendo University Graduate School of Medicine, Japan
5. Department of Internal Medicine, Juntendo University Koshigaya Hospital, Japan