title: Reply.
authors.affiliation: Department of Medicine, Baylor College of Medicine, Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey Department of Veterans Affairs Medical Center, Houston, TX. Electronic address: echiao@bcm.edu.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Chiao
authors.affiliation: Department of Obstetrics and Gynecology, Boston Medical Center, Boston, MA.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Stier
mesh_terms: D001005:Anus Neoplasms / Q000453:epidemiology*; D002278:Carcinoma in Situ / Q000453:epidemiology*; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology*; D005260:Female; D015658:HIV Infections / Q000453:epidemiology*; D006801:Humans; D030361:Papillomavirus Infections / Q000453:epidemiology*; D011349:Proctitis / Q000453:epidemiology*