1. Department of Kinesiology, California State University-Long Beach, Long Beach, CA, USA
2. Center for Army Analysis, Fort Belvoir, VA, USA
3. Department of Mathematical Sciences, United States Military Academy-West Point, West Point, NY, USA
4. Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
5. School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, USA
6. College of Health and Human Services, University of North Carolina, Charlotte, NC, USA
7. Department of Kinesiology, The University of Alabama, Tuscaloosa, AL, USA