Fig. 1From: Cost-effectiveness analysis of different types of human papillomavirus vaccination combined with a cervical cancer screening program in mainland ChinaMarkov model of the history of high and low risk type of HPV. The arrows direct transitions from one state to another. hr, high-risk; lr, low-risk; CIN, cervical intraepithelial neoplasia; HPV, human papillomavirusBack to article page