1. Department of Pathology, Imperial College Healthcare NHS Trust, London W12 OHS, UK
2. International Network for Cancer Treatment and Research, B1180 Brussels, Belgium
3. Service d’Hématologie et Immunologie Biologiques, Cytogénétique, Traitement de l’Hémophilie et Thérapie Transfusionnelle, 94275 Le Kremlin-Bicêtre Cedex, France
4. Department of Pathology, University of Siena, 53100 Siena, Italy