1. From the Duke Clinical Research Institute, Durham, NC (R.M., E.D.P., S.L., M.T.R., T.Y.W.); University of North Carolina, Chapel Hill (S.W.G.); Brigham and Women's Hospital, Boston, MA (S.D.W., E.M.A.); University of Oklahoma Health Sciences Center, Oklahoma City (J.F.S.); and Boston University School of Medicine, Boston, MA (A.K.J.).