1. Department of Gynecology, People's Hospital of Xiangshui County, Xiangshui County, Jiangsu Province, China.
2. Department of Gynecology and Obstetrics, Affiliated Hospital of Nantong University, Nantong City, Jiangsu Province, China.
3. Clinical Laboratory, First People's Hospital of Yancheng City, Yancheng City, Jiangsu Province, China.