1. Key Laboratory of Tropical Disease Control (Sun Yat-sen University); Ministry of Education; Guangzhou China
2. Guangdong Province Key Laboratory of Functional Molecules in Oceanic Microorganism (Sun Yat-sen University); Bureau of Education; Guangzhou China
3. Department of Microbiology; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou China
4. Department of Medical Statistic and Epidemiology; School of Public Health; Sun Yat-sen University; Guangzhou China
5. Department of Biochemistry; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou China
6. Fetal Medicine Center; Department of Obstetrics and Gynecology; First Affiliated Hospital of Sun Yat-sen University; Guangzhou China
7. Department of Clinical Medicine; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou 510080 China