1. Department of Cardiology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, 1-8-1, Jigyohama, Chuo-ku, Fukuoka, Fukuoka 810-8563, Japan
2. Department of Cardiovascular Surgery, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, 1-8-1, Jigyohama, Chuo-ku, Fukuoka, Fukuoka 810-8563, Japan