[1] Leeds Teaching Hosp NHS Trust, HMDS Lab, Leeds LS1 3EX, W Yorkshire, England
[2] Gen Infirm Leeds, Leeds Teaching Hosp NHS Trust, Dept Hematol, Leeds, W Yorkshire, England
[3] Leeds Teaching Hosp NHS Trust, Reg Cytogenet Unit, Leeds, W Yorkshire, England
[4] Huddersfield Royal Infirm, Dept Hematol, Huddersfield HD3 3EA, W Yorkshire, England