Ma, Beilei
Wang, Tengkai
Li, Juan
Wang, Qian
Article History
Received: 30 November 2021
Accepted: 17 January 2022
First Online: 18 July 2022
Declarations
:
: Human umbilical cords were harvested from patients with written consent under approval by the Ethics Committee of Shandong University (No. 2018022).
: Not applicable.
: The authors declare that they have no competing interests.