title: Sampling bias explains association between human papillomavirus and circumcision.
authors: Robert S
authors: RS
authors: Van Howe
mesh_terms: D002944:Circumcision, Male; D006801:Humans; D008297:Male; D027383:Papillomaviridae / Q000302:isolation & purification*; D030361:Papillomavirus Infections / Q000453:epidemiology*; D015983:Selection Bias