1. Department of Epidemiology, School of Public Health, Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology Suzhou Medical College of Soochow University Suzhou China
2. Department of Medical Management Gansu Provincial Hospital Lanzhou China
3. Department of Neurology Affiliated Hospital of North China University of Science and Technology Tangshan Hebei China
4. Department of Neurology Kerqin District First People’s Hospital of Tongliao City Tongliao China
5. Department of Epidemiology Tulane University School of Public Health and Tropical Medicine New Orleans LA USA