Article History
Received: 22 December 2018
Accepted: 26 March 2019
First Online: 16 April 2019
Compliance with ethical standards
:
: The authors have declared that no competing interests exist.
: All the subjects undergoing egg retrievals and consenting for this research, and all the clinical data were collected with the consent of the subjects and their family members and signed the relevant informed consent. Moreover, the experimental design was approved by the Committee for Ethics of Beijing Tongren Hospital.
: This study is approved by all authors for publication.
: All data are included in this published article.