1. Department of Health Behavior and Health Education, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA.
2. Center for Biostatistics in AIDS Research, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
3. Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA.
4. Department of Clinical Psychology, San Diego State University, San Diego, California, USA.
5. Department of Biostatistics, Gillings School of Public Health, Collaborative Studies Coordinating Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
6. Frontier Science and Technology Research Foundation, Amherst, New York, USA.