1. School of Nursing; Sun Yat-sen University; Guangzhou China
2. School of Public Health; Sun Yat-sen University; Guangzhou China
3. Department of Neurology; Guangdong Provincial Hospital of Chinese Medicine; Guangzhou China
4. Department of Neurology and Stroke Center; the Third Affiliated Hospital; Sun Yat-sen University; Guangzhou China
5. Department of Biostatistics; School of Public Health; Guangdong Pharmaceutical University; Guangzhou China
6. Department of Neurology and Stroke Center; the Second Affiliated Hospital; Sun Yat-sen University; Guangzhou China