无创通气治疗老年慢性阻塞性肺疾病合并Ⅱ型呼吸衰竭疗效观察
무창통기치료노년만성조새성폐질병합병Ⅱ형호흡쇠갈료효관찰
The observation of clinical efficacy of BiPAP non-invasive mechanical ventilation treatment on elderly COPD combined with respiratory failure type Ⅱ
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