Channa E. Schmeink, MD, Leon F. Massuger, MD, PhD, Charlotte H. Lenselink, MD, PhD, Wim G. Quint, PhD, Willem J. Melchers, PhD, and Ruud L. Bekkers, MD, PhD (Obstet Gynecol 2010;116:67–75) OBJECTIVE:  To estimate the effect of the menstrual cycle and oral contraceptive pill (OCP) use on the prevalence, incidence, and persistence of human papillomavirus(HPV). […]