title: Limitations in characterization of heterosexual HIV transmission risk: commentary on the models of Downs and De Vincenzi.
authors.forename: S H
authors.initials: SH
authors.lastname: Vermund
mesh_terms: D018562:Disease Transmission, Infectious / Q000706:statistics & numerical data; D005260:Female; D015658:HIV Infections / Q000635:transmission*; D006801:Humans; D008297:Male; D015233:Models, Statistical; D012307:Risk Factors; D012725:Sexual Behavior; D015229:Sexually Transmitted Diseases, Viral / Q000635:transmission*