1. From the University of Pennsylvania, Philadelphia (R.G., R.L.W.); University of Pittsburgh, Pittsburgh, Pa (F.S., H.A.C., K.M.D.); University of Chicago, Chicago, Ill (D.P.F.); Uniformed Services University of the Health Sciences, Bethesda, Md (W.K.L.); and New York University Medical Center, New York, NY (J.S.).