A simple nomogram for predicting failure of non-invasive respiratory strategies in adults with COVID-19: a retrospective multicentre study by Liu, Ling, Prof, Xie, Jianfeng, MD, Wu, Wenjuan, MD, Chen, Hui, MD, Li, Shusheng, MD, He, Hongli, MD, Yu, Yuetian, MD, Hu, Ming, MD, Li, Jinxiu, MD, Zheng, Ruiqiang, MD, Li, Xuyan, MD, Qiu, Haibo, Prof, Tong, Zhaohui, Prof, Du, Bin, Prof, Fan, Eddy, MD, Yang, Yi, Prof, Slutsky, Arthur S, Prof

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