[1] Newcastle Univ, Fac Med Sci, Inst Cell & Mol Biosci, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[2] Royal Victoria Infirm, Northern Oesophagogastr Unit, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[3] Royal Victoria Infirm, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[4] Castle Hill Hosp, Technost Ltd, Cottingham HU16 5JQ, East Yorkshire, England
[5] Newcastle Univ, Food & Human Nutr Dept, Nanyang Polytech, Singapore, Singapore
[6] Newcastle Univ, Fac Med Sci, Inst Cellular Med, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England