The Impact of Perioperative Radiotherapy on Disease-Specific Survival in Patients with Localized Retroperitoneal Liposarcoma: A Population-Based Propensity-Score Matched Analysis - Wilhelm, Alexander; Wiesler, Benjamin; Kümmerli, Christoph; Gross, Markus W.; Kettelhack, Christoph; Müller, Beat P. (Annals of Surgical Oncology, 2025)