Acquisition, Persistence, and Clearance of Human Papillomavirus Infection Among Male Virgins Residing in Brazil, Mexico, and the United States - Liu, Zhiyue; Nyitray, Alan G.; Hwang, Lu-Yu; Swartz, Michael D.; Abrahamsen, Martha; Lazcano-Ponce, Eduardo; Villa, Luisa Lina; Giuliano, Anna R. (Journal of infectious diseases, 2018)