1. Department of Cardiology (R.Y., M.T., F. Yashima, T.A., K.F., K.H.), Keio University School of Medicine, Tokyo, Japan.
2. Department of Diagnostic Radiology (M.J.), Keio University School of Medicine, Tokyo, Japan.
3. Department of Cardiovascular Surgery (H.S.), Keio University School of Medicine, Tokyo, Japan.
4. Teikyo University School of Medicine, Tokyo, Japan (Y.W.).
5. New Tokyo Hospital, Matsudo, Japan (T.N.).
6. Kishiwada Tokushukai Hospital, Osaka, Japan (A.H.).
7. Osaka City General Hospital, Japan (K.M.).
8. Saiseikai Yokohama-City Eastern Hospital, Tsurumi, Japan (M.A.).
9. Sendai Kousei Hospital, Japan (N.T.).
10. Shonan Kamakura General Hospital, Japan (F. Yamanaka).
11. Department of Hygiene and Public Health and Center for Clinical Research, Nippon Medical School, Tokyo, Japan (T.O.).
12. Toyohashi Heart Center, Japan (M.Y.).
13. Nagoya Heart Center, Japan (M.Y.).