Jie Zhang1, De-Yi Luo2, Hong Shen1. 1. Department of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, People's Republic of China. 2. Department of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, People's Republic of China. luodeyi1985@163.com.