Department of Cardiology, Kokura Memorial Hospital, 3-2-1 Asano, Kokurakita, Kitakyushu, Fukuoka, 802-8555, Japan. kenji-ando@live.jp. Department of Cardiology, Kansai Electric Power Hospital, Osaka, Japan. Department of Cardiology, Nabari City Hospital, Nabari, Japan. Department of Cardiology, The Sakakibara Heart Institute of Okayama, Okayama, Japan. Department of Cardiovascular Medicine, Fukuyama Cardiovascular Hospital, Fukuyama, Japan. Department of Cardiovascular Medicine, Ageo Central General Hospital, Ageo, Japan. Department of Cardiovascular Medicine, Suwa Red Cross Hospital, Suwa, Japan. Department of Cardiology, Fukuyama City Hospital, Fukuyama, Japan. Department of Cardiovascular Medicine, National Hospital Organization Kagoshima Medical Center, Kagoshima, Japan. Department of Cardiology, Azumino Red Cross Hospital, Azumino, Japan. Department of Cardiovascular Medicine, Asahi General Hospital, Asahi, Japan. Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan. The Cardiovascular Institute, Tokyo, Japan. Department of Cardiovascular Medicine, Ina Central Hospital, Ina, Japan. Department of Cardiology, Marunouchi Hospital, Tokyo, Japan. Department of Internal Medicine, Ibaraki Seinan Medical Center Hospital, Sashima, Japan. Department of Cardiology, Sendai Kousei Hospital, Sendai, Japan. Department of Cardiovascular Medicine, Toho University Medical Center Sakura Hospital, Sakura, Japan. Department of Radiology, Tokai University Hachioji Hospital, Hachioji, Japan. Department of Cardiovascular Medicine, Japanese Red Cross Okayama Hospital, Okayama, Japan. Department of Cardiology, NTT Medical Center Tokyo, Tokyo, Japan. Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan.