1. Medical Research Council (MRC) Toxicology Unit, University of Leicester, United Kingdom;
2. Leukaemia Research Cytogenetics Group, Cancer Sciences Division, University of Southampton, United Kingdom;
3. Institute of Human Genetics, University Hospital Schleswig-Holstein, Campus Kiel, Germany;
4. Merseyside & Cheshire Genetics Laboratory, Liverpool Women's Hospital, United Kingdom;
5. Second Medical Department, University Hospital Schleswig-Holstein, Campus Kiel, Germany;
6. Departamento de Genética, Universidad de Navarra, Pamplona, Spain;
7. South West Regional Cytogenetics Centre, Southmead Hospital, Bristol, United Kingdom;
8. Children's Cancer Research Institute, Vienna, Austria;
9. Center for Human Genetics, Leuven, Belgium;
10. Paediatric Malignancy Cytogenetics Laboratory, Great Ormond Street Hospital for Sick Children, London, United Kingdom;
11. Laboratoire d'Hématologie, Hôpital de Hautepierre, Strasbourg, France;
12. Cancer Research UK Medical Oncology Unit, St Bartholomew's Hospital Medical School, Queen Mary University of London, United Kingdom;
13. South Australia Cancer Cytogenetics Unit, Institute of Medical and Veterinary Science, Adelaide, Australia;
14. Unité de Cytogénétique Hématologique, EO210 Institut National de la Santé et de la Recherche Médicale (INSERM), Groupe Hospitalier Pitié-Salpetriere, Paris, France;
15. Unité de Cytogénétique Hématologique, Service d'Histo-Embryologie et de Cytogénétique, Hôpital Necker–Enfants Malades, Paris, France;
16. MLL Münchner Leukämielabor, Munich, Germany;
17. Sheffield Regional Cytogenetics Service, Sheffield Children's Hospital, United Kingdom;
18. Department of Pharmacy and Pharmacology, University of Bath, United Kingdom