1. School of Health & Kinesiology, University of Nebraska at Omaha , 6001 Dodge Street, H&K 207U, Omaha, NE 68182-0216 , USA
2. University of North Carolina, Chapel Hill, Center for Health Promotion and Disease Prevention , 1700 Martin Luther King Jr. Boulevard, Chapel Hill, NC 27599-7426 , USA
3. University of North Carolina, Chapel Hill, Gillings School of Global Public Health 2202 , McGavran-Greenberg Hall, Chapel Hill, NC 27599 , USA
4. Department of Health Sciences, University of North Carolina School of Medicine , Bondurant Hall, CB #7120, Chapel Hill, NC 27599 , USA