1. Department of Upper GI, Bariatric & Minimally Invasive Surgery, St James’ University Hospital, Leeds Teaching Hospitals NHS Trust, Leeds, UK
2. Department of General Surgery, Laboratory of Experimental Surgery and Surgical Research, University of Athens, Athens, Greece
3. Department of Upper Gastrointestinal Surgery, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
4. Department of Cancer and Genomic Sciences, Institute of Cancer and Genomic Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK