Funding for this research was provided by:
National Natural Science Foundation of China
Received: 3 January 2022
Accepted: 4 July 2022
First Online: 22 July 2022
: The study received approval and informed consent waiver from the Ethics Committee of the Reproductive Medicine Ethics Committee of The Affiliated Hospital of the Shandong University of Traditional Chinese Medicine (Research Ethics Committee approval number: SZ2020050108), which waived informed consent owing to the retrospective cohort study design. All patients did not provide written signed informed consent. All methods were conducted in compliance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.