1. From the Department of Epidemiology, Harvard School of Public Health, Boston, Mass (I.-M.L., H.D.S., Y.O., R.S.P.); Division of Preventive Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Mass (I.-M.L., H.D.S.); Sports Medicine Research Center, Keio University, Yokohama, Japan (Y.O.); and Division of Epidemiology, Stanford University School of Medicine, Calif (R.S.P.).