1. Department of Neurology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, P.R. China,
2. Department of Neurology, Seventh People’s Hospital of Chengdu, Chengdu, Sichuan Province, P.R. China,
3. Department of Thoracic Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan Province, P.R. China,
4. Department of Neurology, Chengdu First People’s Hospital, Chengdu, Sichuan Province, P.R. China and
5. Department of Geriatric Neurology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, P.R. China