Funding for this research was provided by:
Study on Bile Acids on ICP Placental Vessel Formation and Regulation Mechanism (20130A)
key laboratory of engineering structures damage and diagnosis of hunan province (2017ZC0223)
Received: 30 June 2021
Accepted: 25 February 2022
First Online: 7 March 2022
: This study was approved by the Ethics Committee of the First Affiliated Hospital of Guangzhou Medical University. The version number was V 1.0. All patients signed an informed consent form before the operation.
: All participants provided consent for the publication of individual pseudonymised quotations.
: The authors declare that they have no competing interests.