Risk factors associated with COVID-19 infection: a retrospective cohort study based on contacts tracing by Tao Liu, Wenjia Liang, Haojie Zhong, Jianfeng He, Zihui Chen, Guanhao He, Tie Song, Shaowei Chen, Ping Wang, Jialing Li, Yunhua Lan, Mingji Cheng, Jinxu Huang, Jiwei Niu, Liang Xia, Jianpeng Xiao, Jianxiong Hu, Lifeng Lin, Qiong Huang, Zuhua Rong, Aiping Deng, Weilin Zeng, Jiansen Li, Xing Li, Xiaohua Tan, Min Kang, Lingchuan Guo, Zhihua Zhu, Dexin Gong, Guimin Chen, Moran Dong, Wenjun Ma

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