Funding for this research was provided by:
National Natural Science Foundation of China (81871675, 81430052)
the National Key Research and Development Program of China (2018YFA0507300)
the grant from National Natural Science Foundation of China (81900562, 81871676)
Text and Data Mining valid from 2020-01-09
Received: 15 July 2019
Revised: 9 December 2019
Accepted: 23 December 2019
First Online: 9 January 2020
Ethics approval and consent to participate
: The use of human umbilical cord samples was approved by the Nanjing Medical University Ethics Committee. All experiments about animals were performed in accordance with the guidelines and study protocols of the Institutional Animal Care and Use Committee of Nanjing Medical University (Approval No. IACUC-1601193).
: Not applicable.
: The authors declare that they have no competing interests.