1. Cardiology Division, Imizu Municipal Hospital
2. Cardiovascular Medicine, Fukuoka Saiseikai Futsukaichi Hospital
3. Department of Cardiology and Nephrology, Mie University Graduate School of Medicine
4. Second Department of Internal Medicine, Toyama University Hospital
5. Cardiovascular Medicine, Japan Community Health Care Organization Takaoka Fushiki Hospital
6. Cardiovascular Medicine, Akita University Hospital
7. Cardiovascular Medicine, Wakamatsu Hospital of the University of Occupational and Environmental Health
8. Sleep Apnea Center, Kyushu University Hospital
9. Cardiovascular Medicine, Jichi Medical University Saitama Medical Center