1. Centre for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
2. Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
3. Henan Provincial Obstetrical and Gynaecological Diseases (Reproductive Medicine) Clinical Research Centre, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China