1. Department of General Medicine, The First Affiliated Hospital of Anhui Medical University, Hefei, P. R. China
2. Department of Neurology, Fu Yang Fifth People’s Hospital, Fuyang, P.R. China
3. Department of Neurology, The First Affiliated Hospital of Anhui University of Science and Technology (The First People’s Hospital of Huainan City), Huainan, P.R. China
4. School of Medicine, Anhui University of Science and Technology, Huainan, P.R. China
5. Key Laboratory of Industrial Dust Prevention and Control and Occupational Safety and Health of the Ministry of Education, Anhui University of Science and Technology, Huainan, P.R. China
6. Department of Neurology (Sleep Disorder), The Affiliated Chaohu Hospital of Anhui Medical University, Hefei, Chaohu, P.R. China
7. Department of Hematology, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, P.R. China;