[1] Northumbria Healthcare NHS Trust, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[2] Univ Newcastle Upon Tyne, Sir James Spence Inst, Royal Victoria Infirm, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[3] Univ Newcastle Upon Tyne, Sch Med, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[4] Univ Hosp Coventry, Coventry, W Midlands, England
[5] Walsgrave Gen Hosp, Warwickshire NHS Trust, Coventry, W Midlands, England
[6] Newcastle Gen Hosp, Newcastle Upon Tyne NE4 6BE, Tyne & Wear, England