1. School of Public Health (Shenzhen), Sun Yat-sen University, Guangdong, China
2. School of Public Health, Zhejiang Chinese Medical University, Hangzhou, China
3. State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health (GIBH), Chinese Academy of Sciences, Guangzhou, China
4. Key Laboratory of Tropical Disease Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China