About the Authors

Gang Li

Contributed equally to this work with: Gang Li, Nannan He

Affiliation Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

Nannan He

Contributed equally to this work with: Gang Li, Nannan He

Affiliation Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

Haixia Jin

Affiliation Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

Yan Liu

Affiliation Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

Yihong Guo

Affiliation Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

Yingchun Su

Affiliation Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

Yingpu Sun

syp2008@vip.sina.com

Affiliation Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GL NNH. Performed the experiments: GL NNH HXJ. Analyzed the data: YL. Contributed reagents/materials/analysis tools: YHG YCS YPS. Wrote the paper: GL NNH. Participated in study supervision and in critical reading of the manuscript: YPS.