1. From the Emory University (F.N., G.C., M.L., M.C.), Atlanta, Ga; Brown University (E.F.), Providence, RI; Wayne State University (S.C.), Detroit, Mich; University of California, San Francisco (J.C.H.); University of South Alabama (R.Z.), Mobile; University of Virginia, Charlottesville (K.J.); San Francisco General Hospital (D.B.), Calif; University of Pennsylvania (S.K.), Philadelphia.