1. Hainan Medical University, Haikou 571199, Hainan Province, China
2. Central Laboratory, Hainan General Hospital/Hainan Affiliated Hospital of Hainan Medical University, Haikou 570311, Hainan Province, China
3. Department of Gynaecology and Obstetrics, Hainan Affiliated Hospital of Hainan Medical University/Hainan General Hospital, Haikou 570311, Hainan Province, China