1 Department of Cardiovascular Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
2 Department of Cardiovascular Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. yasutomihigashikuni@g.ecc.u-tokyo.ac.jp.
3 Department of Cardiovascular Medicine, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima-shi, Tokushima, 770-8503, Japan.