Department of Geriatric Neurology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, 650032, PR China. Department of Neurology, Seventh People's Hospital of Chengdu, 610041, PR China. Department of Emergency Internal Medicine Guang'an Men South Area Hospital, China Academy of Chinese Medical Sciences, 102600, PR China. Department of Anesthesia, Kunming Xishan District People's Hospital, Kunming, Yunnan Province, 650100, PR China. Department of Neurology, West China Hospital, Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan Province, 610041, PR China. Department of Geriatric Neurology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, 650032, PR China. Electronic address: Huiren2006@163.com. Department of Geriatric Neurology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, 650032, PR China. Electronic address: ynkmlba@163.com.