title: Safer sex maintenance among gay men: are we making any progress?
authors.forename: M L
authors.initials: ML
authors.lastname: Ekstrand
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000517:prevention & control*; D006716:Homosexuality; D006801:Humans; D008297:Male; D012307:Risk Factors; D012725:Sexual Behavior