1. From the Center for Cardiovascular Disease Prevention (P.M.R., J.E.B., N.R.C., N.R.), the Divisions of Preventive Medicine (P.M.R., J.E.B., N.R.C.) and Cardiology (P.M.R.), and the LeDucq Center for Cardiovascular Research (P.M.R., N.R.), Brigham and Women’s Hospital, and the Department of Laboratory Medicine, Children’s Hospital (N.R.), Harvard Medical School, Boston, Mass.