1. Department of Cardiovascular Medicine (Y.H., W.L., G.N., K. Tanaka, T.I., E.T., I.K.), The University of Tokyo, Japan.
2. Department of Clinical Laboratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (K. Tanaka).
3. Department of Cardiovascular Medicine, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan (D.F.).
4. Department of Pediatrics (Y. Tanaka, Y.H.), The University of Tokyo, Japan.
5. Second Department of Medicine, University of Toyama, Japan (T.I.).
6. Department of Cardiovascular Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Japan (M.S.).