[1] Sandwell & West Birmingham Hosp NHS Trust, Birmingham, W Midlands, England
[2] Royal Wolverhampton Hosp NHS Trust, Wolverhampton, England
[3] Univ Wolverhampton, Wolverhampton, England
[4] Univ Birmingham, Birmingham, W Midlands, England
[5] Univ Hosp Birmingham NHS Fdn Trust, Birmingham, W Midlands, England
[6] North Tees & Hartlepool NHS Fdn Trust, Stockton On Tees, England
[7] Newcastle Univ, Fac Med Sci, Newcastle Upon Tyne, Tyne & Wear, England
[8] Heartburn Canc, Basingstoke, Hants, England
[9] Univ Oxford, Oxford, England