1. Department of Emergency Medicine, Brooke Army Medical Center, JBSA Fort Sam Houston, TX 78234, USA
2. U.S. Army Institute of Surgical Research, JBSA Fort Sam Houston, TX 78234-7767, USA
3. Department of Military and Emergency Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
4. 40th Forward REssucitative Surgical Detachment, 627th Hospital Center, Fort Carson, CO, USA