A Randomized Controlled Trial of Chinese Medicine on Nonmotor Symptoms in Parkinson’s Disease oleh Ka-Kit Chua, Adrian Wong, Kam-Wa Chan, Yin-Kei Lau, Zhao-Xiang Bian, Jia-Hong Lu, Liang-Feng Liu, Lei-Lei Chen, Ka-Ho Chan, Kim-Pong Tse, Anne Chan, Ju-Xian Song, Justin Wu, Li-Xing Zhu, Vincent Mok, Min Li