1. Hospital of the University of Pennsylvania, Philadelphia (A.M.).
2. University of Minnesota, Minneapolis (F.L.N., N.S.R., R.J.K., M.R.R., L.Y.C.).
3. Wake Forest University, Winston-Salem, NC (E.Z.S.).
4. Emory University, Atlanta, GA (W.T.O., A.A.).
5. Brigham and Women’s Hospital, Boston, MA (A.M.S., B.L.C., S.D.S.).
6. Johns Hopkins University, Baltimore, MD (R.F.G.).
7. University of Washington, Seattle, (S.R.H.).