1. Department of Gynecology and Obstetrics, Affiliated Dongguan People’s Hospital, Southern Medical University, Dongguan 523059, China
2. Department of Obstetrics and Gynecology, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Third Affiliated Hospital of Guangzhou Medical University, Guangzhou 510150, China
3. Department of Otolaryngology Head and Neck Surgery, Affiliated Dongguan People’s Hospital, Southern Medical University, Dongguan 523059, China
4. State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environment and Resources, Guangzhou Institute of Geochemistry Chinese Academy of Sciences, Guangzhou 510150, China