1. Department of Cardiology, Kobe Central Hospital, Kobe, Japan
2. Department of Cardiovascular Medicine, Juntendo University School of Medicine, Tokyo, Japan
3. Cardiovascular Respiratory Sleep Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
4. Department of Cardiology, Fukuoka Sanno Hospital, Fukuoka, Japan
5. Department of Cardiology, Kokura Memorial Hospital, Kitakyushu, Japan