1. Mayo Clinic, Rochester, MN;
2. Hospital Clinic, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain;
3. Mayo Clinic, Scottsdale, AZ;
4. Ospedale di Circolo e Fondazione Macchi, Varese, Italy;
5. MD Anderson Cancer Center, Houston, TX;
6. University of Florence, Florence, Italy;
7. Stanford University School of Medicine, Stanford, CA;
8. Service d'Hématologie Clinique, Centre Hospitalier de Lens, Lens, France;
9. Department of Haematology, St. Thomas Hospital, London, United Kingdom;
10. Mount Sinai School of Medicine, New York, NY;
11. Medical University of Vienna, Vienna, Austria;
12. University Hospital Hamburg-Eppendorf, Hamburg-Eppendorf, Germany;
13. University of Cologne, Cologne, Germany;
14. Division of Hematology and Research Foundation, Ospedale Papa Giovanni XXIII, Bergamo, Italy; and
15. Center for the Study of Myelofibrosis, Biotechnology Research Area, Istituto Di Ricovero e Cura a Carattere Scientifico Policlinico S. Matteo Foundation, Pavia, Italy