Received: 10 August 2021
Accepted: 15 November 2021
First Online: 9 December 2021
: All participating couples gave their written informed consent for the reporting and publishing of the results of the study. The protocol for this retrospective study was approved by the Ethics Committee for research involving human subjects in our hospital (Research Project No. 2016 066).
: All authors contributed to the study. They have all seen the final version and consent to its submission.
: The authors declare that they have no competing interests.