1. a Department of Sociology , California State University , Dominguez Hills, Carson , CA , USA
2. b Community Based Research , AIDS Project Los Angeles , Los Angeles , CA , USA
3. c RAND , Santa Monica , CA , USA
4. d UCLA/RAND Center for Adolescent Health Promotion , University of California, Los Angeles , Los Angeles , CA , USA
5. e Department of Sociology , University of California , Los Angeles , CA , USA
6. f Treatment Education , AIDS Project Los Angeles , Los Angeles , CA , USA
7. g Children's Hospital Boston, Division of Pediatrics , Harvard Medical School , Boston , MA , USA