1. Department of Oncology, Pathology and Dermatology, Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264000, P.R. China
2. Department of Urology, Mianyang Central Hospital, Mianyang, Sichuan 621000, P.R. China
3. School of Basic Medical Sciences, Binzhou Medical University, Yantai, Shandong 264003, P.R. China