Early prediction of noninvasive ventilation failure in COPD patients: derivation, internal validation, and external validation of a simple risk score by Jun Duan, Shengyu Wang, Ping Liu, Xiaoli Han, Yao Tian, Fan Gao, Jing Zhou, Junhuan Mou, Qian Qin, Jingrong Yu, Linfu Bai, Lintong Zhou, Rui Zhang

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