Risk of invasive cancer of the cervix in relation to the use of injectable progestogen contraceptives and combined estrogen/progestogen oral contraceptives (South Africa).
Shapiro S, Rosenberg L, Hoffman M, Kelly JP, Cooper DD, Carrara H, Denny LE, du Toit G, Allan BR, Stander IA, Williamson AL. Risk of invasive cancer of the cervix in relation to the use of injectable progestogen contraceptives and combined estrogen/progestogen oral contraceptives (South Africa). Cancer Causes Control. 2003 Jun; 14(5):485-95.