1. Department of Emergency Medicine, Houston McGovern Medical School, University of Texas Health Sciences Center, Houston, Texas, USA
2. Department of Emergency Medicine, University of New Mexico, Albuquerque, New Mexico, USA
3. Rio Rancho Fire Rescue, City of Rio Rancho, Rio Rancho, New Mexico, USA
4. Department of Anesthesiology and Critical Care Medicine, University of New Mexico, Albuquerque, New Mexico, USA