1. Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia.
2. University of North Texas Health Science System College of Pharmacy, Fort Worth, Texas.
3. Walgreen Co., Deerfield, Illinois.
4. HealthHIV, Washington, District of Columbia.
5. ICF, Atlanta, Georgia.
6. Department of Biostatistics and Epidemiology, University of North Texas Health Science Center, Fort Worth, Texas.