1. Department of Cardiology, Mitsubishi Kyoto Hospital , Kyoto , Japan
2. Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University , Kyoto , Japan
3. Department of Cardiology, National Hospital Organization Kyoto Medical Center , 1-1 Mukaihata-cho, Fukakusa, Fushimi-ku, Kyoto 612-8555 , Japan