Funding for this research was provided by:
National Natural Science Foundation of China (No. 81673524)
Major Technology Innovation of Hubei Province (No. 2019ACA140)
National Key Research and Development Program of China (No. 2017YFC1001300)
Medical Science Advancement Program (Basic Medical Sciences) of Wuhan University (No. TFJC2018001)
Received: 21 July 2020
Accepted: 8 March 2021
First Online: 7 April 2021
: The Committee on the Ethics of Animal Experiments of the Wuhan University School of Medicine approved the protocol (Permit 14016). All animal experimental procedures were conducted in accordance with the Guidelines for the Care and Use of Laboratory Animals of the Chinese Animal Welfare Committee. This study was approved by the Research Committee for Human Subjects, Zhongnan Hospital of Wuhan University, China (No. 2016016). All participants provided written informed consent for collecting placentas and further analysis. The study was conducted in accordance with the principle of the Declaration of Helsinki (2013) and in accordance to the ARRIVE Guidelines.
: Not applicable.
: The authors declare that they have no competing interests.