Efficacy and safety of Tongxin formula in the treatment of coronary microvascular disease: A randomized, double-blind, placebo-controlled clinical trial study gan Feng-Qun Xie, Yi-Sheng Wang, Lei Zhang, Wen Zhu, Jie Cheng, Yun-Yan Lu, Shao-Hua Xu, Xian-Kai Li, Qi-Mao Feng

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