1. Friends Research Institute, Inc., Los Angeles, California.
2. Department of Public Health, Rongxiang Xu College of Health & Human Services, California State University, Los Angeles.
3. Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles.
4. Center for HIV Identification, Prevention and Treatment Services, Department of Family Medicine, University of California, Los Angeles.