1. Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston. (H.Y., K.S., D.K., T.N., I.M., I.-K.J.)
2. Department of Cardiology, Tsuchiura Kyodo General Hospital, Ibaraki, Japan (T.S., T.K.).
3. Interventional Cardiology Unit, New Tokyo Hospital, Chiba, Japan (A.N., S.N.).
4. Department of Interventional Cardiology, Tokyo Medical and Dental University, Japan (M.A.).
5. Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles (D.D.).
6. Biostatistics Center, Massachusetts General Hospital, Harvard Medical School, Boston. (H.L.)
7. Division of Cardiology, Kyung Hee University Hospital, Seoul, South Korea (I.-K.J.).