1. CDC Division of STI Prevention, Atlanta, Georgia., Department of Family Medicine and the Colorado Health Outcomes Program, University of Colorado Health Sciences Center, Denver, Colorado. Denver Health and Hospitals Authority, Denver, Colorado.
2. CDC Division of STI Prevention, Atlanta, Georgia.
3. Department of Family Medicine and the Colorado Health Outcomes Program, University of Colorado Health Sciences Center, Denver, Colorado.
4. Denver Health and Hospitals Authority, Denver, Colorado.