title: Letter to the editor concerning "HPV in anal squamous cell carcinoma and anal intraepithelial neoplasia (AIN)" by Varnai et al. (Int J Colorectal Dis 21:135-142, 2006).
authors.forename: Johannes
authors.initials: J
authors.lastname: Jongen
mesh_terms: D017677:Age Distribution; D052685:Alphapapillomavirus / Q000302:isolation & purification*; D001005:Anus Neoplasms / Q000821:virology*; D002278:Carcinoma in Situ / Q000821:virology*; D002294:Carcinoma, Squamous Cell / Q000821:virology*; D015658:HIV Infections / Q000150:complications; D006801:Humans; D012307:Risk Factors