1. Department of Medicine, Washington University School of Medicine, St. Louis, Missouri (E.R.D.)
2. University of Michigan Medical School, Ann Arbor, Michigan (J.M.R., K.J., A.S.)
3. University of Michigan Medical School and Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan (S.S., V.C.)
4. Health Research & Educational Trust, American Hospital Association, Chicago, Illinois (A.J.R.)