1. Department of Cardiovascular Medicine, Kobe City Medical Center General Hospital: 2-1-1 Minatojimaminamicho , Chuo-ku, Kobe 650-0047 , Japan
2. Division of Cardiology, Shimane University Faculty of Medicine , 89-1 Enya-cho, Izumo 693-8501 , Japan
3. Division of Cardiology, Saiseikai Senri Hospital: 1-1-6 Tsukumodai , Suita 565-0862 , Japan