1. Peter O'Donnell Jr. School of Public Health, UT Southwestern Medical Center, Dallas, Texas, USA.
2. Harold C. Simmons Comprehensive Cancer Center, UT Southwestern Medical Center, Dallas, Texas, USA.
3. Departments of Psychology and Family and Community Medicine, University of Arizona, Tucson, Arizona, USA.
4. Department of Internal Medicine, UT Southwestern Medical Center, Dallas, Texas, USA.
5. Parkland Health, Dallas, Texas, USA.