Therapeutic Efficacy of High-flow Nasal Cannula and Noninvasive Positive-pressure Ventilation in AECOPD Patients with Various APACHE Ⅱ Scores after Extubation 
HU Shu-li*,TANG Hao,FAN Xue-peng
Chinese General Practice . 2018, (15): 1790 -1795 .  DOI: 10.3969/j.issn.1007-9572.2017.00.258