Preoperative Psoas Muscle Index and Psoas Attenuation in Patients Undergoing Nephrectomy for Renal Cell Carcinoma: A Retrospective Cohort Study. - Ipek OM; Dincer E; Aydiner O; Sevinc AH; Hanci Sevinc B; Aras E (Medicina (Kaunas, Lithuania), 2026)