Zhong, Yunqing, Xiufeng Wang, Guanglan Xu, Bing Mao, Wei Zhou, Jie Min, Hongli jiang, Xiang Diao, and Juanjuan Fu. 2013. “MODIFIED YUPINGFENG FORMULA FOR THE TREATMENT OF STABLE CHRONIC OBSTRUCTIVE PULMONARY DISEASE: A SYSTEMATIC REVIEW OF RANDOMIZED CONTROLLED TRIALS”. African Journal of Traditional, Complementary and Alternative Medicines 11 (1):1-14. https://journals.athmsi.org/index.php/ajtcam/article/view/1908.