Efficacy and Safety of Lianhua Qingke Tablets in the Treatment of Long Coronavirus Disease (COVID) Cough: A Randomized, Double-Blind, Placebo-Controlled, Multicenter Clinical Study by Xiaolong Xu, Jie Ying, Taiping Tian, Tengwen Liu, Chunhua Chi, Zhizhong Gong, Jingpeng Gao, Meiping Qian, Wei Tan, Ran Cao, Shuixian Lv, Zhougui Ling, Shuo Wang, Bo Li, Qingquan Liu

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