Firnhaber, Cynthia, Hoa Van Le, Audrey Pettifor, Doreen Schulze, Pam Michelow, Ian Sanne, David Lewis, et al. (2010) 2010. “Association Between Cervical Dysplasia and Human Papillomavirus in HIV Seropositive Women from Johannesburg South Africa.”. Cancer Causes & Control : CCC 21 (3): 433-43. doi:10.1007/s10552-009-9475-z.