1. School of Nursing, Sun Yat-sen University , 74 Zhongshan Rd. 2, Guangzhou 510089 , China
2. Department of Neurology, Guangdong Provincial Hospital of Chinese Medicine , 111 Dade Rd., Guangzhou 510120 , China
3. Department of Neurology, The Third Affiliated Hospital of Sun Yat-sen University , 2693 Kaichuang Road, Guangzhou 510013 , China