1. From Tufts Medical Center (J.F.P.), Tufts University School of Medicine, Boston, Mass; the Division of Preventive Medicine (S.D.P.), University of Alabama at Birmingham, Birmingham, Ala; the Division of Prevention and Population Sciences (G.S.W.), National Heart, Lung, and Blood Institute, Bethesda, Md; the University of Wisconsin School of Medicine and Public Health (A.G.), Madison, Wis; the Division of Epidemiology and Community Health (D.R.J.), School of Public Health, University of Minnesota,...