[1] Brunel Univ, Ctr Cell & Chromosome Biol, London, England
[2] Brunel Univ, Brunel Inst Canc Genet & Pharmacogen, Div Biosci, London, England
[3] John Radcliffe Hosp, Nuffield Dept Clin Lab Sci, LRF Mol Haematol Unit, Oxford OX3 9DU, England
[4] NIHR Biomed Res Ctr, Oxford, England
[5] Wellcome Trust Ctr Human Genet, Oxford, England
[6] Univ Giessen, Dept Paediat Haematol & Oncol, Oncogenet Lab, Giessen, Germany
[7] Clin Pediat Univ Milano Bicocca, Ctr Ric Tettamanti, Monza, Italy