1. Air Force 59th MDW/ST—En Route Care Research Center, JBSA Ft Sam Houston, TX 78234, USA
2. Department of Emergency Medicine, Brooke Army Military Medical Center, JBSA Ft Sam Houston, TX 78234, USA
3. Department of Military and Emergency Medicine, Uniformed Services University, Bethesda, MD 20814, USA
4. Critical Care Medicine, Brooke Army Military Medical Center, JBSA Ft Sam Houston, TX 78234, USA
5. Center for COMBAT Research, Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, CO 80045, USA