1. Palliative and Advanced Illness Research Center, Perelman School of Medicine, and Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, Pennsylvania (G.E.W., M.P.K., S.D.H.)
2. Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania (Y.Y., N.B.G.)
3. Leonard Davis Institute of Health Economics and Perelman School of Medicine, University of Pennsylvania, and Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania (P.W.G., R.M.W.)