| Albert Y Liu Limited knowledge and use of HIV post- and pre-exposure prophylaxis among gay and bisexual menAlbert Y Liu Department of Medicine, San Francisco Department of Public Health, San Francisco, CA, USA J Acquir Immune Defic Syndr 47:241-7. 2008 Bone mineral density in HIV-negative men participating in a tenofovir pre-exposure prophylaxis randomized clinical trial in San FranciscoAlbert Y Liu San Francisco Department of Public Health, San Francisco, California, United States of America PLoS ONE 6:e23688. 2011 Preexposure chemoprophylaxis for HIV prevention in men who have sex with menRobert M Grant J David Gladstone Institutes, University of California at San Francisco, 1650 Owens St, San Francisco, CA 94158, USA N Engl J Med 363:2587-99. 2010 Preexposure prophylaxis for HIV: unproven promise and potential pitfallsAlbert Y Liu HIV Research Section, San Francisco Department of Public Health, San Francisco, Calif 94102, USA JAMA 296:863-5. 2006
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