1. Department of Cardiovascular Medicine, Nippon Medical School Tama-Nagayama Hospital, 1-7-1, Nagayama, Tama-shi, Tokyo 206-8512, Japan
2. Department of Cardiology, National Hospital Organization Kyoto Medical Center, 1-1, Mukaihata-cho, Fukakusa, Fushimi-ku, Kyoto 612-8555, Japan