Fig. 2From: Risk factors for human papillomavirus infection, cervical intraepithelial neoplasia and cervical cancer: an umbrella review and follow-up Mendelian randomisation studiesDistribution of studies across evidence grade for all exposures of either increased or decreased risk (y-axis) by exposure category (X-axis) from the main analysis (summary random effects for cohort studies only) and outcome a HPV infection; b cervical intraepithelial neoplasia; and c cervical cancerBack to article page