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| Clinical Effect of Indacaterol Maleate and Glycopyrronium Bromide Powder for Inhalation Combined with Chymotrypsin in the Treatment of Frequent Acute Exacerbation Phenotype of COPD |
| PENG Feng, CHENG Jiangtao, HOU Hongmei, JIANG Fangfang |
| First-author's address: Department of Respiratory and Critical Care Medicine, Yuebei People's Hospital, Shaoguan 512026, China |
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