1. From the Department of Cardiology, Keio University School of Medicine, Japan Science and Technology CREST, Tokyo, Japan (T.S., M.I.); Japan Science and Technology CREST, Tokyo, Japan (M.I.); Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan (S.Y.); and Gladstone Institute of Cardiovascular Disease, San Francisco, CA (S.Y.).