%0 Journal Article %T Efficacy and safety of Xuebijing injection and its influence on immunomodulation in acute exacerbations of chronic obstructive pulmonary disease: study protocol for a randomized controlled trial %A Chen Yao %A Hongcai Shang %A Junhua Zhang %A Lixin Xie %A Peng Yan %A Sheling Xie %A Si Liu %A Xiaoyan Yan %A Yuliang Huo %A Zhiqiao Feng %J Archive of "Trials". %D 2019 %R 10.1186/s13063-019-3204-z %X The online version of this article (10.1186/s13063-019-3204-z) contains supplementary material, which is available to authorized users %K Xuebijing injection %K Acute exacerbation of chronic obstructive pulmonary disease %K Efficacy %K Safety %K Immunomodulation %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6380049/