The effectiveness of pay-it-forward in addressing HPV vaccine delay and increasing uptake among 15–18-year-old adolescent girls compared to user-paid vaccination: a study protocol... by Yifan Li, Chuanyu Qin, Shengyue Qiu, Yu He, Linchuan Pang, Xiaolan Xu, Vivian Wan-Cheong Yim, Shenglan Tang, Heng Du, Wenfeng Gong, Fan Yang, Joseph D. Tucker, Weiming Tang, Yun Wang, Leesa Lin, Mark Jit, Wei Song, Chunrong Li, Jennifer Smith, Jing Li, Dan Wu

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