1. Department of Epidemiology, Gillings School of Global Public Health, The University of North Carolina-Chapel Hill, Chapel Hill, North Carolina.
2. Student Wellness Center, Office of Student Life, The Ohio State University, Columbus, Ohio.
3. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota.
4. Division of Health Behavior/Health Promotion, College of Public Health, The Ohio State University, Columbus, Ohio.