1. Reproductive Medicine Center, Liuzhou Maternity and Child Healthcare Hospital, Liuzhou, China
2. Liuzhou Institute of Reproduction and Genetics, Liuzhou, China
3. Affiliated Maternity Hospital and Affiliated Children’s Hospital of Guangxi, University of Science and Technology, Liuzhou, China
4. Guangxi Zhuang Autonomous Region Reproductive Hospital, Nanning, China