1. Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
2. Keiyu Orthopedic Spine and Joint Hospital, Tokyo 120-0015, Japan
3. Cardiovascular Respiratory Sleep Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
4. Intensive Care Unit and Department of Cardiology, Toranomon Hospital, Tokyo 105-8470, Japan
5. Sanwa Kagaku Kenkyusho Co., Ltd., Inabe 511-0406, Japan
6. Sleep and Sleep Disordered Breathing Center, Juntendo University Hospital, Tokyo 113-8431, Japan