1. From the Department of Internal Medicine (T.J.I., R.A.H., B.K.N.), University of Michigan Medical School, Ann Arbor, Mich; the Department of Medicine (J.M.K.), University of Pennsylvania School of Medicine, Philadelphia, Pa; Leonard Davis Institute of Health Economics (J.M.K.), University of Pennsylvania, Philadelphia, Pa; and VA Ann Arbor Healthcare System (R.A.H., B.K.N.), Ann Arbor, Mich.