1. Perelman School of Medicine, University of Pennsylvania, and Corporal Michael J. Crescenz VA Medical Center, Philadelphia, Pennsylvania (J.B.C.)
2. Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania (D.L.C., D.S.H.)
3. Stanford University School of Medicine, Stanford, California, and Veterans Affairs Palo Alto Health Care System, Palo Alto, California (J.T.L.)
4. University of Michigan Medical School, Ann Arbor, Michigan (J.B.B.)
5. Stanford University School of Medicine, Stanford, California (V.B.).