Prophylactic Ureteral Catheter Placement Appears to Reduce Intraoperative Ureteric Injury During Resection of Primary Retroperitoneal Liposarcoma oleh Xiaobing Chen MD, Jun Chen MD, Ferdinando Carlo Maria Cananzi MD, Wenjie Li MD, Vittorio Quagliuolo MD, Chenghua Luo MD, PhD, Yinmo Yang MD, PhD