1. Bristol Institute for Transfusion Sciences, NHS Blood and Transplant, Bristol, United Kingdom;
2. Institut de Biologie du Développement et Cancer Unité Mixte de Recherche 6543, Université de Nice–Centre National de La Recherche Scientifique, Nice, France;
3. Department of Biochemistry, University of Bristol, Bristol, United Kingdom;
4. Honeylands Specialist Children's Centre, Royal Devon and Exeter, United Kingdom;
5. Institute of Neuroscience, Newcastle University, Newcastle, United Kingdom;
6. Astbury Centre for Structural Molecular Biology, Institute of Membrane and Systems Biology, University of Leeds, Leeds, United Kingdom;
7. Department of Medicine, San Rafael Medical Center, San Rafael, CA;
8. Laboratoire Central d'Hematologie et Hôpital Saint-Eloi, Montpellier, France;
9. Inserm U 779, Faculté de Médecine Paris-Sud, Université Paris-Sud, Le Kremlin-Bicêtre, France; and
10. Department of Medicine, University College London, London, United Kingdom