[1] Univ Hosp Birmingham NHS Trust, Ctr Clin Haematol, Birmingham, W Midlands, England
[2] Nottingham Univ Hosp NHS Trust, Ctr Clin Haematol, Nottingham, England
[3] Univ Birmingham, Canc Res UK Clin Trials Unit, Birmingham, W Midlands, England
[4] Birmingham Heartlands Hosp, Hlth Protect Agcy Lab, Birmingham B9 5ST, W Midlands, England
[5] Nottingham Univ Hosp NHS Trust, Dept Virol, Nottingham, England
[6] Nottingham Univ Hosp NHS Trust, Dept Infect Dis, Nottingham, England