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1Centre for Surgical Research, School of Social and Community Medicine, Bristol, UK; Division of Surgery, Head and Neck, University Hospitals NHS Foundation Trust, Bristol, UK. Electronic address: firstname.lastname@example.orgInstitute of Cancer Research Clinical Trials and Statistics Unit, London, UK.3Division of Psychosocial Research and Epidemiology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.4Division of Surgery and Interventional Science, University College London, London, UK.5Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK; Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway.