1. From the University of Chicago (L.B.), Chicago, Ill; Institute of Critical Care Medicine (M.H.W.), Palm Springs, Calif; University of California (T.B.), Berkeley; University of Texas Southwestern (J.C.), Dallas; University of Arizona (K.K.), Tucson; University of Ottawa (G.N.), Ottawa, Ontario, Canada; Uniformed Services University (I.S.), Bethesda, Md; Johns Hopkins University (M.L.W., R.T., R.W.), Baltimore, Md; the Cleveland Clinic Foundation (H.W.), Cleveland, Ohio; and the National Heart, Lung,...