1. Department of Emergency Medicine, West Virginia University, Morgantown, WV 26506, USA
2. Department of Family Medicine, West Virginia University, Morgantown, WV 26506, USA
3. Department of Human Performance, West Virginia University, Morgantown, WV 26506, USA
4. Department of Microbiology, Immunology, & Cell Biology, West Virginia University, Morgantown, WV 26506, USA
5. Department of Emergency Medicine, Stanford University, Palo Alto, CA 94304, USA