Efficacy and safety of umeclidinium/inhaled corticosteroid/ longacting β2agonist in treatment of chronic obstructive pulmonary disease: a metaanalysis
Hu Guang1, Liu Zihan1, Du Linjiao1, Wei Yuna1, Zeng Ming2
Clinical Focus . 2019, (1): 77 -84 .  DOI: 10.3969/j.issn.1004-583X.2019.01.012