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    Wen Yang, Yan Song, Yun-Long Lu, Jun-Zhong Sun, Hong-Wei Wang, Increased expression of programmed death (PD)-1 and its ligand PD-L1 correlates with impaired cell-mediated immunity in high-risk human papillomavirus-related cervical intraepithelial neoplasia, Immunology, 2013, 139, 4