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1 Radcliffe Department of Medicine, National Blood Transfusion Service, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK. Electronic address: david.roberts@ndcls.ox.ac.uk.
2 Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, UK. Electronic address: liz.rose@imm.ox.ac.uk.
1 Radcliffe Department of Medicine, National Blood Transfusion Service, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK. Electronic address: david.roberts@ndcls.ox.ac.uk.
2 Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, UK. Electronic address: liz.rose@imm.ox.ac.uk.