1. Department of Sociology, University of California, Riverside, Riverside, California, USA
2. Department of Public Health, University of California, San Diego, San Diego, California, USA
3. Department of Community Health Sciences, UCLA Fielding School of Public Health, Los Angeles, California, USA
4. HIV and Aging Research Project-Palm Springs, Palm Springs, California, USA
5. Desert AIDS Project, Palm Springs, California, USA
6. Center for Healthy Communities, School of Medicine, University of California, Riverside, Riverside, California, USA