title: Outside the box: HIV prevention with hard-to-categorize people.
authors.forename: Don
authors.initials: D
authors.lastname: Operario
mesh_terms: D005260:Female; D015658:HIV Infections / Q000517:prevention & control*; D006801:Humans; D008297:Male; D012725:Sexual Behavior; D012747:Sexual Partners; D014189:Transsexualism