Efficacy and safety of umbilical cord mesenchymal stem cells for the treatment of patients with COVID-19 by Fengtao Wei, Dexiao Kong, Tao Li, Ai Li, Yi Tan, Jinfeng Fang, Xianghua Zhuang, Chao Lai, Weihua Xu, Hong Dong, Chengen Ma, Ke Hong, Yuqin Cui, Shengbin Tang, Fenggang Yu, Chengyun Zheng

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