1. Yale University, New Haven, Connecticut, USA
2. Gramercy Research Group, Winston-Salem, North Carolina, USA
3. University of Pittsburgh, Pittsburgh, Pennsylvania, USA
4. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
5. Center for AIDS Prevention Studies, San Francisco, California, USA
6. East Carolina University, Greenville, North Carolina, USA
7. Essential Engagement, Inc., Tarboro, North Carolina, USA