Hiroaki Shimokawa1, Nobuhiro Kikuchi2, Kimio Satoh2. 1. From the Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (H.S., N.K., K.S.); and Research Fellow of the Japan Society for the Promotion of Science, Tokyo, Japan (N.K.). shimo@cardio.med.tohoku.ac.jp. 2. From the Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (H.S., N.K., K.S.); and Research Fellow of the Japan Society for the Promotion of Science, Tokyo, Japan (N.K.).