Effectiveness of pay it forward intervention compared to free and user-paid vaccinations on seasonal influenza vaccination among older adults across seven cities in China: study pr... by Qing-Qing Li, Zizhen Huang, Jiangyun Chen, Junjie Wang, Duqiao Li, Xiaoshan Chen, Qing Zhao, Siyuan Liu, Wenjun He, Huanyuan Luo, Yuting Wan, Guangyu Tong, Dexing Zhang, Yiyuan Cai, Huijuan Liang, Dan Wu, David Bishai, Dong Roman Xu

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