About the Authors
- Cui-Ling Li, Kai Zhao, Qiong Yu, Hui-Ping Zhang
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Tao Jiang, Xiu-Zhen Hu
- Suizhou Maternal and Child Health-care Hospital, Suizhou, Hubei, China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: HPZ CLL. Performed the experiments: TJ XZH. Analyzed the data: KZ QY. Wrote the manuscript: CLL.