human 215 Humans 191 Human immunodeficiency virus infection 166 male 150 HIV Infections 147 adult 144 female 138 HIV 124 Male 113 Female 106 Adult 105 Article 77 controlled study 77 major clinical study 75 Human immunodeficiency virus 66 nonhuman 64 middle aged 63 psychology 61 Middle Aged 59 article 57 adolescent 55 young adult 53 Young Adult 52 Adolescent 50 cohort analysis 35 sexual behavior 34 anti human immunodeficiency virus agent 32 Anti-HIV Agents 29 Homosexuality, Male 29 antiretroviral therapy 29