1. Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
2. Cancer Prevention and Control Program, University of South Carolina, Columbia, SC, USA
3. College of Nursing, University of South Carolina, Columbia, SC, USA
4. Bioanalytics Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
5. WJB Dorn VA Medical Center, Columbia, SC, USA
6. Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University of Buffalo, the State University of New York, Buffalo, NY, USA