1 NHS Blood and Transplant, University Hospitals Birmingham NHS Foundation Trust, Vicent Drive, Edgbaston, Birmingham, B15 2SG, UK.
2 NHSBT/Oxford University Hospital NHS Foundation Trust, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Headington, Oxford, OX3 9BQ, UK.
3 Department of Hemotherapy and Hemostasis, University Clinic Hospital, University of Barcelona, Villarroel 170, 08036 Barcelona, Spain.