1. Department of General Surgery, Endocrine and Transplant Surgery, Medical University of Gdansk, Gdańsk, Poland
2. Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy
3. Division of Radiotherapy, IEO European Institute of Oncology, IRCCS, Milan, Italy
4. Department of Radiation Oncology, Mount Vernon Cancer Centre, Northwood, UK
5. Department of Surgery, Colorectal Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA