1. Department of Gynecology, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China
2. Jining Hospital of Traditional Chinese Medicine, Jining, Shandong 272029, P.R. China
3. Department of Pathology, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China