1 Northern Oesophagogastric Unit, Royal Victoria Infirmary, Newcastle Upon Tyne, UK.
2 Department of Upper Gastrointestinal Surgery, Queen Elizabeth Hospital, Birmingham, UK.
3 National Center for Esophageal and Gastric Cancer, Department of Surgery, Trinity Centre for Health Sciences, Trinity College Dublin, and St. James's Hospital, Dublin 8, Ireland.
4 Northern Oesophagogastric Unit, Royal Victoria Infirmary, Newcastle upon Tyne, UK.