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. 2020 Dec 8;7:607821. doi: 10.3389/fmed.2020.607821

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Copyright © 2020 Xu, Yang, Huang, Zou, Zhou, Pan, Yang, Wu, Ouyang, Wang, Xu, Zhao, Shu, Jiang, Xiong, Ren, Liu, Yuan, Qi, Fu, Chen, Zhang, Yuan and Shang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Success curves of HFNC therapy in patients from HFNC onset to termination according to different levels of score. (A) Training cohort; (B) validation cohort; For HFNC failure in hospital: weighted score 0–6 = low risk; ≥6 = high risk. HFNC, high-flow nasal cannula.