1. Senckenberg Institute of Pathology, University of Frankfurt; Germany
2. Department of Pathology and Laboratory Medicine; Weill Cornell Medical College; New York NY
3. Institute of Pathology, University of Cologne; Cologne Germany
4. Center for the Study of Myelofibrosis, Biotechnology Research Area, Istituto di Ricovero e Cura a Carattere Scientifico Policlinico S. Matteo Foundation; Pavia Italy
5. Department of Hematopathology; MD Anderson Cancer Center; Houston
6. Dipartimento di Medicina Sperimentale e Clinica, University of Florence; Florence Italy
7. Department of Pathology; Massachusetts General Hospital; Boston
8. Centre d'Investigations Cliniques, Hôpital Saint-Louis; Paris France
9. Pathology Unit, University of Milan Medical School, Fondazione IRCCS Cà Granda; Ospedale Italy
10. Weill Cornell Medical College; NewYork NY
11. Tufts Medical Center; Boston
12. Division of Hematology and Research Foundation; Ospedale Papa Giovanni XXIII; Bergamo Italy