1 Medical Center for Human Reproduction, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China; Center of Reproductive Medicine, Children's Hospital of Shanxi and Women Health Center of Shanxi, Taiyuan, Shanxi, China.
2 Center of Reproductive Medicine, Children's Hospital of Shanxi and Women Health Center of Shanxi, Taiyuan, Shanxi, China.
3 Medical Center for Human Reproduction, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China.
4 Medical Center for Human Reproduction, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China. Electronic address: wenhuizhouhure@163.com.