Clinical factors associated with postoperative hydronephrosis after ureteroscopic lithotripsy oleh Sun Woo Kim, Ji Hoon Ahn, Sang Un Yim, Yang Hyun Cho, Bo Sung Shin, Ho Seok Chung, Eu Chang Hwang, Ho Song Yu, Kyung Jin Oh, Sun-Ouck Kim, Seung Il Jung, Taek Won Kang, Dong Deuk Kwon, Kwangsung Park