1. From the Departments of Radiology (N.T., R.F., K.K.K., S.A.) and Cardiovascular Biology and Medicine (Y.N., S.F., D.T., A.K., Y. Kamo, C.A., Y. Kawaguchi, K.T., M.H., T.D., S.O., T.M.), Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.