1. United States Air Force En route Care Research/59th Medical Wing/Science & Technology , JBSA Lackland Air Force Base, TX 78236, USA
2. Department of Emergency Medicine, Brooke Army Medical Center , JBSA Ft. Sam Houston, TX 78234, USA
3. Department of Military and Emergency Medicine, Uniformed Services University , Bethesda, MD 20814, USA
4. US Army Institute of Surgical Research , JBSA Ft. Sam Houston, TX 78234, USA