Effects of different-valent vaccines against human papillomavirus (HPV) to prevent persistent HPV16/18 infections and CIN2+ in women: A systematic review and network meta-analysis

To evaluate the efficacy of 2-valent, 4-valent and 9-valent HPV vaccination in preventing persistent HPV infections and cervical intraepithelial neoplasia grade 2 or higher (CIN2+) lesions among women with different infection statuses at baseline.