Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China;
Department of Neurosurgery, General Hospital of the Chinese People's Liberation Army Chengdu Military District, Chengdu 610083, Sichuan, China;
Department of Neurosurgery, General Hospital of the Chinese People's Liberation Army Chengdu Military District, Chengdu 610083, Sichuan, China;
Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China;
Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China;