1 Department of Cardiology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama, 701-0192, Japan. takeshi24@hotmail.co.jp.
2 Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan. takeshi24@hotmail.co.jp.
3 Department of Cardiology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama, 701-0192, Japan.
4 Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan.