1 From the Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania (M.H.Y.); the Department of Anesthesiology, University of Pittsburgh, Pennsylvania (J.H.W.); and the Department of Pediatrics, Division of Critical Care Medicine, Washington University in St. Louis, St. Louis, Missouri (P.C.S.). U.S. Army Institute of Surgical Research, San Antonio, Texas U.S. Armed Services Blood Program, Washington, DC AABB, Bethesda, Maryland Department of Surgery, Division of Trauma and Emergency Surgery, University of Texas San Antonio, San Antonio, Texas AABB, Bethesda, Maryland Department of Surgery, University of Colorado, Denver, Colorado Johns Hopkins University School of Medicine, Baltimore, Maryland Magen David Adom National Blood Services, Ramat Gan, Israel Department of Laboratory Medicine, Boston Children's Hospital, Boston, Massachusetts Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota Department of Emergency Medicine, Michigan Center for Integrative Research in Critical Care, University of Michigan, Ann Arbor, Michigan.