[1] St James Univ Hosp, Leeds LS9 7TF, W Yorkshire, England
[2] Royal Victoria Hosp, Newcastle Upon Tyne, Tyne & Wear, England
[3] Leeds Gen Infirm, Haematol Malignancy Diagnost Serv, Leeds, W Yorkshire, England
[4] Sheffield Teaching Hosp NHS Trust, Sheffield, S Yorkshire, England