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Guangzhou Center for Disease Control and Prevention, Southern Medical University - Department of Epidemiology, Guangzhou Center for Disease Control and Prevention, Southern Medical University - Department of Epidemiology, Guangzhou Center for Disease Control and Prevention, Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou Center for Disease Control and Prevention, Southern Medical University - Department of Neurosurgery, Department of Epidemiology, School of Public Health, Southern Medical University, Southern Medical University - Department of Epidemiology, Southern Medical University - Department of Epidemiology, Department of Epidemiology, School of Public Health, Southern Medical University, Southern Medical University - Department of Epidemiology, Southern Medical University - Department of Epidemiology, Southern Medical University - Department of Epidemiology, Guangzhou Center for Disease Control and Prevention and Southern Medical University - Department of Epidemiology