1. Josep Carreras Leukemia Research Institute and Department of Biomedicine, School of Medicine, University of Barcelona, Barcelona, Spain;
2. Centro de Investigación Biomédica en Red de Cáncer, ISCIII, Barcelona, Spain;
3. Service d’Hématologie Biologique, Hospital Armand Trousseau, Paris, France;
4. Instituto de Biomedicina y Biotecnología de Cantabria, Universidad de Cantabria-CSIC, Santander, Spain;
5. Instituciò Catalana de Recerca i Estudis Avançats, Barcelona, Spain; and
6. Wellcome Centre for Human Genetics, University of Oxford, Oxford, United Kingdom