1. State Key Laboratory of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510120, China
2. School of Public Health, Guangzhou Medical University, Guangzhou, Guangdong 511436, China
3. Zhuhai Center for Chronic Disease Control and Prevention, Zhuhai, Guangdong 519060, China
4. Department of Pulmonary and Critical Care Medicine, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong 519000, China
5. Department of Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, Guangdong 510080, China