Contact patterns between index patients and their close contacts and assessing risk for COVID-19 transmission during different exposure time windows: a large retrospective observat... by Weibing Wang, Genming Zhao, Hao Pan, Bo Zheng, Chenyan Jiang, Yaxu Zheng, Huanyu Wu, Shenghua Mao, Ye Yao, Xiaohuan Gong, Sheng Lin, Bihong Jin, Dechuan Kong

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