Traditional risk scores do not properly predict perioperative morbidity and mortality for retroperitoneal sarcoma resection. Issue 7 (30th July 2022) - Angelucci, Michela; Strumia, Alessandro; Gronchi, Alessandro; Alloni, Rossana; Schiavoni, Lorenzo; Improta, Luca; Sgarlato, Giuseppe; Agrò, Felice E.; Fairweather, Mark; Valeri, Sergio