CLINICAL OUTCOMES OF RETROPERITONEAL LAPAROSCOPIC URETEROLITHOTOMY FOR UPPER URETERAL STONES AT NGHE AN FRIENDSHIP GENERAL HOSPITAL. YHCĐ [Internet]. 2026 July 6 [cited 2026 Sept. 9];67(CĐ7-Trường ĐH Y Dược Hải Phòng). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/5623