Funding for this research was provided by:
National Natural Science Foundation of China (31771469, 31571363, 81772762)
National Key Research and Development Program of China (2017YFC0908500)
Natural Science Foundation of Shanghai (19ZR1461600)
Mildred-Scheel post-doctoral fellowship of the German Cancer Aid Foundation (70111755)
Received: 18 May 2020
Accepted: 9 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This study has been approved by the ethics committee of Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine (Ethics code: KS1748). All of the participants signed an informed consent and the investigators obtained the written informed consent prior to entry into the study.
: Not applicable.
: The authors declare that they have no competing interests.