1. 1Department of Hematology and Oncology, University Hospital Mannheim, Heidelberg University, Mannheim, Germany
2. 2Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA
3. 3Division of Hematology, Stanford Cancer Institute/Stanford University School of Medicine, Stanford, CA
4. 4Versiti Blood Research Institute and Division of Hematology and Oncology, Medical College of Wisconsin, Milwaukee, WI
5. 5Division of Hematology/Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI
6. 6Institute of Mastocytosis Studies of Castilla-La Mancha (CLMast) and Centro de Investigación Biomédica en Red Cáncer (CIBERONC), Spanish Reference Center of Mastocytosis, Toledo, Spain
7. 7Center for Research and Innovation of Myeloproliferative Neoplasms (CRIMM), Azienda Ospedaliera Universitaria Careggi, University of Florence, Florence, Italy
8. 8Department of Oncology, Hematology, Hemostaseology, and Stem Cell Transplantation, University Hospital RWTH Aachen, Aachen, Germany
9. 9Clinic and Polyclinic for Hematology, Cell Therapy and Hemostaseology, Leipzig University, Leipzig, Germany
10. 10Department of Hematology, Rare Diseases Reference Center for Mastocytoses (CEREMAST), Assistance Publique-Hôpitaux de Paris (APHP)-Necker-Enfants Malades Hospital, and Imagine Institute-INSERM U1163, Paris University, Paris, France
11. 11Department of Hematology, Oslo University Hospital, Oslo, Norway
12. 12Blueprint Medicines Corporation, Cambridge, MA
13. 13Blueprint Medicines International (Switzerland), Zug, Switzerland
14. 14Blueprint Medicines (Germany) GmbH, Munich, Germany
15. 15Guy’s & St Thomas’s NHS Foundation Trust, London, United Kingdom