1. Department of Cardiology Tokushima University Hospital Tokushima Japan
2. Department of Cardiology Saitama Medical University International Medical Center Hidaka Japan
3. Department of Cardiology Kawashima Hospital Tokushima Japan
4. Department of Cardiology Shikoku Medical Center for Children and Adults Zentsuji Japan
5. Hara Clinic Higashi‐Hiroshima Higashi‐Hiroshima Japan
6. Department of Cardiology Kagawa Prefectural Central Hospital Takamatsu Japan
7. Department of Internal Medicine Higashi‐Matsuyama Medical Association Hospital Higashimatsuyama Japan