1. Molecular and Population Genetics; Division of Genetics and Epidemiology; Institute of Cancer Research; Sutton; Surrey; SM2 5NG; UK
2. Centro Ricerca Tettamanti; Clinica Pediatrica; Universita di Milano-Bicocca; Ospedale San Gerardo, Via Pergolesi, 33; 20052; Monza (Mi); Italy
3. Haemato-Oncology Research Unit; Division of Molecular Pathology; Institute of Cancer Research; Surrey; SM2 5NG; UK