1. Department of Medical & Molecular Genetics, King's College London, United Kingdom;
2. Wessex Regional Genetics Laboratory, University of Southampton School of Medicine, Salisbury, United Kingdom;
3. Department of Clinical & Biological Sciences, University of Turin, Italy;
4. III Medizinische Universitätsklinik, Medizinische Fakultät Mannheim, University of Heidelberg, Mannheim, Germany;
5. Laboratoire d'Hématologie, Hôpital Calmette, Lille, France;
6. Department of Haematology, Imperial College, London, United Kingdom;
7. Institute of Hematology and Medical Oncology, University of Bologna, Italy;
8. Department of Haematology, Ealing Hospital, London, United Kingdom