1. Department of Geriatric Neurology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunan Province, P.R. China,
2. Department of Neurology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, P.R. China,
3. Department of Anesthesia, Kunming Xishan District People’s Hospital, Kunming, Yunnan Province, P.R. China, and
4. Department of Neurology, The Third People’s Hospital of Yunnan Province, Kunming, Yunnan Province, P.R. China