Mechanisms of motor symptom improvement by long-term Tai Chi training in Parkinson’s disease patients oleh Gen Li, Pei Huang, Shi-Shuang Cui, Yu-Yan Tan, Ya-Chao He, Xin Shen, Qin-Ying Jiang, Ping Huang, Gui-Ying He, Bin-Yin Li, Yu-Xin Li, Jin Xu, Zheng Wang, Sheng-Di Chen