1. From the Departments of Epidemiology (L.C.P., N.R.P.) and Health Policy and Management (N.R.P.), Johns Hopkins Bloomberg School of Public Health, Baltimore, Md; Department of Medicine (E.R.M., N.R.P.), Johns Hopkins School of Medicine, Baltimore, Md; Department of Medicine (L.A.S.), Tufts Medical Center, Boston, Mass; Department of Medicine (R.S.) and Department of Biostatistics, School of Public Health (K.M.), University of Michigan, Ann Arbor; and the Divisions of Adult and Community Health (N.F.)...