1. Clinical Laboratory and Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
2. Central Laboratory, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
3. Department of Gynecology, Dongchangfu People's Hospital, Liaocheng, Shandong 252000, P.R. China