1 Nuffield Department of Surgical Sciences, University of Oxford, Oxford, OX3 9DU, UK. Electronic address: sheraz.markar@nds.ox.ac.uk.
2 Amsterdam UMC, University of Amsterdam, Department of Surgery, Amsterdam, Netherlands; Cancer Center Amsterdam, Cancer Treatment and Quality of Life, Amsterdam, Netherlands.
3 Department of General, Visceral, Thoracic and Transplantation Surgery, University Clinic of Cologne, Cologne, Germany.
4 Division of Thoracic and Upper Gastrointestinal Surgery, Department of Surgery, McGill University Health Centre, Montreal, QC, Canada.
5 Department of Surgery, University Medical Centre, Utrecht, Netherlands.
6 Department of Thoracic and Cardiovascular Surgery, University of Texas MD Anderson Cancer Center, Houston, TX, USA.
7 Department of Clinical Science Intervention and Technology, Karolinska Institutet and Department of Upper Abdominal Diseases, Karolinska University Hospital, Stockholm, Sweden.