Immunogenicity of trivalent seasonal influenza vaccine in patients with chronic obstructive pulmonary disease by Yan Li, Ying Ma, Zhijie An, Chenyan Yue, Yamin Wang, Yunqiu Liu, Xiaodong Yuan, Shuping Zhang, Ming Shao, Changgui Li, Keli Li, Zundong Yin, Liye Wang, Huaqing Wang

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