1. Department of Obstetrics and Gynecology, Liuzhou Maternity and Child Healthcare Hospital, Liuzhou, Guangxi, China
2. Department of Gynecology, The Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, Guangxi, China
3. Center of Reproductive Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
4. Department of Laboratory Medicine, Liuzhou People’s Hospital, Liuzhou, Guangxi, China