Long- versus short-duration systemic corticosteroid regimens for acute exacerbations of COPD: A systematic review and meta-analysis of randomized trials and cohort studies oleh Zhen Zhao, Owen Lou, Yiyang Wang, Raymond Yin, Carrie Gong, Florence Deng, Ethan C. Wu, Jing Yi Xie, Jerry Wu, Avery Ma, Yongzhi Guo, Wei Ting Xiong