Funding for this research was provided by:
Natural Science Foundation of Shandong Province (No.ZR2021QH011)
Received: 14 April 2022
Accepted: 19 July 2022
First Online: 26 July 2022
: The experimental procedures were approved by the Ethics Committee of Qilu Hospital of Shandong University (KYLL-202111–063-1). Human umbilical cords were obtained from informed, consenting delivery woman and processed as we have previously described.
: Not applicable.
: The authors declare no competing interests.