Cardiopulmonary exercise variables and their association with postoperative morbidity and mortality after major oesophagogastric cancer surgery—a multicentre observational study oleh Malcolm A. West, Saqib Rahman, Sandy Jack, Michael P.W. Grocott, Denny Z.H. Levett, Yasir Rashid, John Griffiths, Martin Ezra, Lyndsay Ayres, Helen Neville-Webbe, Muhammad Shafiq Javed, Milind Shrotri, Iftikhar Khan, David Whitmore, Pradeep Prabhu, David Timbrell, Sophie Allen, Andrew O. Packham, David Sharpe, Helen Anderson, Gary Minto, Samuel McAleer, Stuart McPhail, Mohamed Alasmar, Robert A. Hartley, Javed Sultan, Ben Grace, Timothy J. Underwood, James Byrne, Fergus Noble, Jamie Kelly, Gillian Ansell, Mark Edwards