1. From the Department of Diagnostic and Interventional Radiology (D.U., A.Y., S.L.W., T.M., A.S., Y.M.) and Department of Cardiovascular Medicine (S.E., S.I., M.Y.), Graduate School of Medicine, Osaka City University, 1-4-3 Asahi-machi, Abeno-ku, Osaka 545-8585, Japan; and the Central Clinical Laboratory, Osaka City University Hospital, Osaka, Japan (K.A.).