Effect of traditional Chinese medicine combined with conventional Western medicine for patients with severe/very severe chronic obstructive pulmonary disease: a multi-center, rando... by Jiansheng Li, Yang Xie, Minghang Wang, Suyun Li, Xuefeng Yu, Nianzhi Zhang, Zhengang Zhu, Wei Zhang, Jihong Feng, Zikai Sun, Lin Lin, Zhijia Sun, Hailong Zhang, Xueqing Yu

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