Chinese patent medicine for chronic obstructive pulmonary disease based on principles of tonifying Qi, promoting blood circulation by removing blood stasis, and resolving phlegm: a systematic review of randomized controlled trials

Liu Wei, Yang Shuang, Fu Min, Li Jian, Song Yaling, Wei Baolin, Liu Enshun, Sun Zengtao

Journal of Traditional Chinese Medicine . 2015, (01): 1 -10 .