title: 20 years of hard lessons.
mesh_terms: D000349:Africa / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D005260:Female; D015658:HIV Infections / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission; D015497:HIV-1; D006291:Health Policy / Q000639:trends*; D006801:Humans; D008297:Male