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3. Center for Disease Control and Prevention VOICES/VOCES: video opportunities for innovative condom education and safer sex 2014b http://www.cdc.gov/hiv/prevention/research/compendium/rr/voices.html
4. Center for Disease Control and Prevention HIV and young men who have sex with men 2014c http://www.cdc.gov/healthyyouth/sexualbehaviors/pdf/hiv_factsheet_ymsm.pdf