Changes in coordination of departments for major epidemic prevention and control in China before and after the outbreak of COVID-19： an analysis on official documents by HE Zhonghui, SHI Peiwu, SHEN Qunhong, CHEN Zheng, PU Chuan, XU Lingzhong, HU Zhi, MA Anning, XU Tianqiang, WANG Panshi, WANG Hua, ZHOU Qingyu, LI Chengyue, HAO Mo

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