Effectiveness of inactivated COVID-19 vaccines among older adults in Shanghai: retrospective cohort study per Zhuoying Huang, Shuangfei Xu, Jiechen Liu, Linlin Wu, Jing Qiu, Nan Wang, Jia Ren, Zhi Li, Xiang Guo, Fangfang Tao, Jian Chen, Donglei Lu, Yuheng Wang, Juan Li, Xiaodong Sun, Weibing Wang

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