1. a HIV Center for Clinical and Behavioral Studies , New York State Psychiatric Institute and Columbia University , New York , US
2. b Department of Child and Adolescent Psychiatry , New York University School of Medicine , New York , US
3. c James Bell Associates , Arlington , Virginia , US
4. d Walter R. McDonald & Associates, Inc , Rockville , Maryland , US
5. e Department of Psychiatry and Behavioral Sciences , University of Washington School of Medicine , Washington , US
6. f Center for AIDS Prevention Studies , University of California , California , US