Funding for this research was provided by:
the Shanghai Municipal Health and Family Planning Commission Fund (Grant number: 201540358)
the National Natural Science Foundation of China (Grant number: 81571506, Grant number: 81501234)
Received: 4 May 2019
Accepted: 4 November 2019
First Online: 19 November 2019
Ethics approval and consent to participate
: All participants provided written informed consent for the use of FF and discarded metaphase-I (MI) oocytes obtained during the in vitro fertilization (IVF) process. The Institutional Review Committee of Fudan University approved all the protocols (including animal use) of the 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 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 interests.