^*Division of Trauma Anesthesiology, Keck School of Medicine at the University of Southern California, Los Angeles, California

^†Intensive Care Medicine & Pre-hospital Care, London’s Air Ambulance & Centre for Trauma Sciences, Royal London Hospital, Queen Mary University of London, London, UK

The authors declare that they have nothing to disclose.

address correspondence to: Joshua M. Tobin, MD, Division of Trauma Anesthesiology, Keck School of Medicine at the University of Southern California, 1520 San Pablo Street, Suite 3451, Los Angeles, CA 90033-5315. E-mail: [email protected]