1. From the Department of Biostatistics and Epidemiology and Center for Clinical Epidemiology and Biostatistics (B.L.S., E.A., J.A.B., J.L.K.) and Division of General Internal Medicine (B.L.S.), Schools of Medicine and Dental Medicine (R.S.F.), University of Pennsylvania, Philadelphia, Pa; Department of Medicine (E.A., M.E.L., O.M.K., D.K.), MCP Hahnemann School of Medicine, Philadelphia, Pa; Veterans Affairs Medical Center (R.S.F.), Philadelphia, Pa; and Department of Epidemiology and Preventive...