1. Department of Virology; University College London School of Life and Medical Sciences; London; UK
2. Department of Virology; King's College Hospital; London; UK
3. Department of Haematology; Freeman Road Hospital; Newcastle; UK
4. West of Scotland specialist virology centre; Gartnavel General Hospital; Glasgow; UK
5. Birmingham HPA Laboratory; Birmingham Heartlands Hospital; Birmingham; UK
6. Department of Haematology; King's College Hospital; London; UK
7. Section of Haemato-oncology; The Royal Marsden NHS Foundation Trust; London; UK
8. Department of Haematology; University College London Hospitals; London; UK
9. Blood and Marrow Transplant Unit; Beatson Oncology Centre; Glasgow; UK