1. Oesophagogastric research group, Guy’s and St Thomas’ Oesophago-gastric Centre , London , UK
2. School of Cancer and Pharmaceutical Sciences, King’s College London , London , UK
3. Department of Cancer Imaging , School of Biomedical Engineering and Imaging Sciences, , London , UK
4. King’s College London , School of Biomedical Engineering and Imaging Sciences, , London , UK
5. Department of Oncology, Maidstone & Tunbridge Wells , Maidstone and Tunbridge Wells , UK
6. Department of Molecular Medicine and Surgery, Karolinska Institutet , Stockholm , Sweden