1. Department of Environmental and Occupational Health, School of Public Health, University of Nevada, Las Vegas, Las Vegas, Nevada, USA.
2. Department of Medical Education, Kirk Kerkorian School of Medicine at UNLV, University of Nevada, Las Vegas, Las Vegas, Nevada, USA.
3. Office of Research, Kirk Kerkorian School of Medicine at UNLV, University of Nevada, Las Vegas, Las Vegas, Nevada, USA.