1. Department of Medicine & Bioregulatory Sciences, University of Tokushima Graduate School of Medicine, Tokushima 770-8503, Japan
2. Department of Cardiology, Tokushima Prefectural Hospital, Tokushima 770-8539, Japan
3. Department of Cardiology, Health Insurance Naruto Hospital, Naruto 772-8503, Japan
4. Kawashima Cardiovascular Clinic, Tokushima 770-0011, Japan