1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Jinan University, No. 613, Huangpu Road West, Tianhe
District, Guangzhou 510630, Guangdong, China
2. Department of Obstetrics and Gynecology, Qingyuan People’s Hospital, Qingyuan 511518, Guangdong, China
3. Department of Fetal Medicine, The First Affiliated Hospital of Jinan University, Guangzhou 510630, Guangdong, China
4. Institute of Molecular and Medical Virology, School of Medicine, Jinan University, No. 601, Huangpu Road West, Tianhe
District, Guangzhou 510632, Guangdong, China