Article History
Received: 8 November 2022
Accepted: 12 December 2022
First Online: 20 December 2022
Declarations
:
: The authors declare no competing interests.
: This study was approved by the institutional review board of the Chinese PLA General Hospital (No. S2018-280–01) and followed the tenets of the Declaration of Helsinki. The parents of all the involved fetuses provided written informed consent for the research and publication of the results.
: The parents of all the involved fetuses provided written informed consent for the publication of the results.
: The authors have no relevant financial or non-financial interests to disclose.