1 Department of Epidemiology, School of Public Health and Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, Medical College of Soochow University, Suzhou, Jiangsu 215123, China.
2 Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA 70112, USA.
3 Department of Neurology, Tongliao Municipal Hospital, Tongliao, Inner mongolia 028007, China.
4 Department of Neurology, Affiliated Hospital of North China University of Science and Technology, Tangshan, Hebei 063000, China.
5 Department of Neurology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226006, China.
6 Department of Medicine, Tulane University School of Medicine, New Orleans, LA 70112, USA.