Fig. 1From: Screening for the prevention and early detection of cervical cancer: protocol for systematic reviews to inform Canadian recommendationsProgression from a human papillomavirus infection to invasive cervical cancer, assuming no treatment. Severe pre-cancer equates to CIN 3. Figures and proportions are approximates adapted from data reported in relevant literature [6, 8,9,10,11, 16,17,18]Back to article page