Funding for this research was provided by:
National Key Research and Development Program of China (2018YFC1004301)
The National Key Research and Development Program of China (2018YFC1003202)
Received: 8 August 2021
Accepted: 3 November 2021
First Online: 26 November 2021
: The study was approved by the Ethics Committee of the Reproductive Medicine Center of Shandong University on December 1, 2017 (reference number: 2666). Signed informed consent was obtained from all parents and agreement obtained from all children.
: Not applicable.
: The authors declare no competing interests.