1. Department of Infectious Diseases, The Key Discipline of Guangdong Province, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151 Yanjiang Road, Guangdong Province 510120, China
2. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151 Yanjiang Road, Guangdong Province 510120, China
3. Guangdong Provincial Key Laboratory of Tropical Disease Research and Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Higher Institutes, School of Public Health and Tropical Medicine, Southern Medical University, No. 1023 South Shatai Road, Guangzhou, Guangdong Province 510515, China