1. From the Clinical Trials Group, National Heart, Lung, and Blood Institute (E.B.S.), Bethesda, Md; University of Calgary (D.V.E.), Canada; University of Washington (Q.Y.), Seattle; and AVID clinical sites at the University of Maryland, Baltimore (L.S.J.), St Luke’s Medical Center, New York, NY (J.S.S.), Baystate Medical Center, Springfield, Mass (J.R.C.); MCP Hahnemann University Hospital, Philadelphia, Pa (S.P.K.); Brigham and Women’s Hospital, Boston, Mass (P.L.F.), University of Alabama at...