Funding for this research was provided by:
Suzhou science and technology development plan (SYS201729)
Jiangsu province maternal and child health research project (F201709)
Article History
Received: 21 February 2021
Accepted: 8 June 2021
First Online: 17 July 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: The study was approved by Ethical Committee of the Second Affiliated Hospital of Soochow University and conducted in accordance with the ethical standards.
: Subjects signed the informed consent.