1. Centre for Regenerative Medicine, Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy;
2. Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy;
3. Center for the Study of Myelofibrosis, Istituto di Ricovero e Cura a Carattere Scientifico Policlinico S. Matteo Foundation, Pavia, Italy;
4. Department of Hematology Oncology, Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo Foundation and University of Pavia, Pavia, Italy;
5. Hematology, Azienda Ospedaliera Papa Giovanni XXIII, Bergamo, Italy;
6. Department of Biology, University of Padua, Padua, Italy; and
7. Center for Genome Research, Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy