1. West Los Angeles Veterans Affairs Medical Center and David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California (N.M.P.)
2. West Los Angeles Veterans Affairs Medical Center, Los Angeles, California (E.A.A., S.M., I.M.M., M.M.B., J.M.S., P.G.S.)
3. Stanford University School of Medicine, Stanford, California (J.D.G.)