Funding for this research was provided by:
Scientific and Innovative Action Plan of Shanghai (14411950200, 14411950201)
National Natural Science Foundation of China (81772797)
Shanghai Municipal Population and Family Planning Commission (201840323)
Received: 28 February 2021
Accepted: 8 June 2021
First Online: 15 June 2021
: The study was approved by the Ethical Committees of Ruijin Hospital, Shanghai Jiao Tong University School of Medicine. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.Informed consent was exempted due to the retrospective design of this study.
: The Author confirms that the work described has not been published before (except in the form of an abstract or as part of a published lecture, review, or thesis); that it is not under consideration for publication elsewhere; that its publication has been approved by all co-authors; that its publication has been approved (tacitly or explicitly) by the responsible authorities at the institution where the work is carried out.
: The authors declare that they have no competing interest.