1. University of Michigan Medical School and Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan (P.K.P., L.M., J.M.)
2. Rush University Medical Center, Chicago, Illinois (K.J.P.)
3. Health Research & Educational Trust, American Hospital Association, Chicago, Illinois (S.C., S.L.)
4. University of Michigan Medical School, Ann Arbor, Michigan (J.M.A.)