1 The General Office of Stroke Prevention Project Committee, National Health Commission of the People's Republic of China, No. 118, Guang'anmen Inner Street, Beijing, 100053, People's Republic of China. tuwenjun@irm-cams.ac.cn.
2 Institute of Radiation Medicine, Chinese Academy of Medical Science and Peking Union Medical College, No. 238, Baiti Road, Tianjin, 300192, People's Republic of China. tuwenjun@irm-cams.ac.cn.
3 The General Office of Stroke Prevention Project Committee, National Health Commission of the People's Republic of China, No. 118, Guang'anmen Inner Street, Beijing, 100053, People's Republic of China.
4 Department of Neurosurgery, Xuanwu Hospital Capital Medical University, Beijing, People's Republic of China.
5 The General Office of Stroke Prevention Project Committee, National Health Commission of the People's Republic of China, No. 118, Guang'anmen Inner Street, Beijing, 100053, People's Republic of China. wangld@nhfpc.gov.cn.
6 School of Public Health, Peking University, Beijing, People's Republic of China. wangld@nhfpc.gov.cn.