Shiping Song1, Yining Zhao2. 1. Department of Urology, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, No. 20, Yuhuangding East Road, Zhifu District, Yantai, 264099, China. 2. Department of Urology, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, No. 20, Yuhuangding East Road, Zhifu District, Yantai, 264099, China. zhaogaga@alumni.sjtu.edu.cn.