1 From the Department of Surgery (R.T.), University of California, San Francisco, San Francisco, California; Comparative Effectiveness and Clinical Outcomes Research Center (R.C.), Riverside University Health Systems Medical Center, Moreno Valley; Loma Linda University School of Medicine (R.C.), Loma Linda, California; Scripps Memorial Hospital La Jolla (W.L.B.), La Jolla, California; University of Colorado (C.C.B.), Aurora, Colorado; University of Florida College of Medicine (C.A.C.), Gainesville, Florida; University of Maryland School of Medicine (C.F.), Baltimore, Maryland; University of Kansas Medical Center (J.L.H.), Kansas City, Kansas; University of Arizona College of Medicine-Phoenix (N.K.), Phoenix, Arizona; Methodist Dallas Medical Center (M.L.), Dallas, Texas; Division of Acute Care Surgery, Department of Surgery (M.J.M., M.S.), Los Angeles General Medical Center, Los Angeles, California; Division of Vascular Surgery and Endovascular Therapy (G.A.M.), Keck Medical Center of USC, Los Angeles, California; Division of Acute Care Surgery, Department of Surgery (L.J.M.), The University of Texas McGovern Medical School - Houston Red Duke Trauma Institute, Memorial Hermann Hospital, Houston, Texas; Medical University of South Carolina (A.R.P.), North Charleston, South Carolina; Yale School of Medicine (K.M.S.), New Haven, Connecticut; St. Joseph's Hospital and Medical Center (J.A.W.), Phoenix, Arizona; and Program in Trauma (D.M.S.), University of Maryland School of Medicine, Baltimore, Maryland.