1. From the Department of Anesthesiology and Critical Care Medicine (S.M.F., W.W.Y., P.J.P.), Department of Medicine (R.N.T., L.C.R.), Department of Pathology, Transfusion Medicine (S.J.P., J.L., T.A.F., P.M.N.), Armstrong Institute for Patient Safety and Quality (K.H.K.L., T.L.W., P.A.W., R.D., P.J.P.), and Department of Otolaryngology Head and Neck Surgery (L.E.I.), The Johns Hopkins Medical Insti