Blazeby, J. M.; Macefield, R.; Blencowe, N. S.; Jacobs, M.; McNair, A. G. K.; Sprangers, M.; Brookes, S. T.; the Research and Consensus Groups of the Core Outcomes and iNformation SEts iN SUrgical Studies – Oesophageal Cancer; Avery, K. N. L.; Blazeby, J. M.; Blencowe, N. S.; Brookes, S...