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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