title: Genital ulcers important HIV risk factor in gay men.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission*; D000328:Adult; D005832:Genital Diseases, Male / Q000150:complications*; D006716:Homosexuality; D006801:Humans; D008297:Male; D012307:Risk Factors; D014456:Ulcer / Q000150:complications