About the Authors

Qianfang Cai

Affiliation Reproductive Medicine Center, Women and Children’s Hospital of Guangdong Province, Guangzhou, China

Fei Wan

Affiliation Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, United States of America

Kai Huang

Affiliation Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China

Hanwang Zhang

hwzhang605@126.com

Affiliation Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: QFC HWZ. Performed the experiments: QFC HWZ KH. Analyzed the data: FW. Contributed reagents/materials/analysis tools: KH HWZ. Wrote the paper: QFC FW HWZ KH.