1 Department of Sarcoma and General Surgery, Midlands Abdominal and Retroperitoneal Sarcoma Unit, University Hospital Birmingham NHS Foundation Trust, Birmingham, UK. fabio.tirotta.chirurgia@gmail.com.
2 Department of Sarcoma and General Surgery, Midlands Abdominal and Retroperitoneal Sarcoma Unit, University Hospital Birmingham NHS Foundation Trust, Birmingham, UK.