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Database for pay-it-forward to reduce HPV vaccine delay and increase uptake. (2025) Li, Jing, Li, Yifan, Qin, Chuanyu, He, Yu, Lu, Haidong, Xie, Yewei, Ong, Jason J., Lu, Yajiao, Yang, Ying, Yang, Fan, Du, Heng, Gong, Wenfeng, Zou, Fei, Larson, Heidi J., Jit, Mark, Lin, Leesa, Smith, Jennifer S., Geng, Elvin H., Xu, Dong, Tang, Weiming, Tang, Shenglan, Tucker, Joseph D., Wu, Dan