1. Department of Gynecology, The Third Affiliated Hospital of Sun Yat‑Sen University, Guangzhou, Guangdong 510630, P.R. China
2. Department of Obstetrics and Gynecology, Dongguan People's Hospital (Affiliated Dongguan Hospital, Southern Medical University), Dongguan, Guangdong 523000, P.R. China
3. Center for Reproductive Medicine, The Third Affiliated Hospital of Sun Yat‑Sen University, Guangzhou, Guangdong 510630, P.R. China
4. Department of Gynecology, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510120, P.R. China