1. 1Department of Hematology and Oncology, University Hospital Mannheim, Heidelberg University, Mannheim, Germany
2. 2Department of Oncology, Hematology, Hemostaseology and Stem Cell Transplantation, University Hospital RWTH Aachen, Aachen, Germany
3. 3Center for Integrated Oncology, Aachen Bonn Cologne Düsseldorf, Aachen, Germany
4. 4Department of Allergology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
5. 5Department of Hematology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
6. 6Department of Allergology, Medical University of Gdańsk, Gdańsk, Poland
7. 7Department of Dermatology, Venereology and Allergology, Medical University of Gdańsk, Gdańsk, Poland
8. 8Division of Hematology & Hemostaseology, Department of Internal Medicine I, Medical University of Vienna, Vienna, Austria
9. 9Ludwig Boltzmann Institute for Hematology and Oncology, Medical University of Vienna, Vienna, Austria
10. 10Department/University Clinic for Companion Animals and Horses, Internal Medicine Small Animals, University Clinic for Small Animals, University of Veterinary Medicine, Vienna, Austria
11. 11University Clinic for Hematology and Oncology, Kepler University Hospital, Johannes Kepler University, Linz, Austria
12. 12Department of Dermatology and Venereology, Allergy Center, Kepler University Hospital, Johannes Kepler University, Linz, Austria
13. 13Department of Medicine, Section of Hematology, Verona University Hospital, Verona, Italy
14. 14Allergy Unit, Verona University Hospital, Verona, Italy
15. 15Department of Medicine I, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
16. 16German Cancer Consortium (DKTK), partner site Freiburg and German Cancer Research Center (DKFZ), Heidelberg, Germany
17. 17Department of Hematology and Oncology, Medical Center, University of Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
18. 18Department of Dermatology, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
19. 19Stanford Cancer Institute, Stanford University School of Medicine/Stanford Cancer Institute, Stanford, CA
20. 20Hematology Unit, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
21. 21Division of Hematology, Department of Medical Sciences Uppsala University, Uppsala, Sweden
22. 22Division of Allergy and Clinical Immunology, University of Salerno, Salerno, Italy
23. 23Department of Hematology, Semmelweis University, Budapest, Hungary
24. 24Department of Medicine, Pediatric Dermatology Unit, University of Padova, Padova, Italy
25. 25Department of Dermatology and Allergy, School of Medicine, Technical University of Munich, Munich, Germany
26. 26KU Leuven Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group and MASTeL, University Hospitals Leuven, Leuven, Belgium
27. 27Division of Hematology, Istanbul Medical School, University of Istanbul, Istanbul, Turkey
28. 28Department of Internal Medicine - Hematology and Oncology, University Hospital Brno & Faculty of Medicine, Masaryk University, Brno, Czech Republic
29. 29Department of Immunology-Allergology-Rheumatology, Faculty of Medicine and Health Sciences, University of Antwerp and Antwerp University Hospital, Antwerpen, Belgium
30. 30Department of Dermatology and Venereology, University Hospital Graz, Graz, Austria
31. 31Division of Allergy, Department of Dermatology, University Hospital Basel and University of Basel, Basel, Switzerland
32. 32Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
33. 33French Reference Center for Mastocytosis, Hospital Necker, Assistance Publique Hôpitaux de Paris, Imagine Institute, University Paris Descartes, Paris, France
34. 34French Reference Center for Mastocytosis, Pitié-Salpêtrière Hospital, Assistance Publique Hôpitaux de Paris, University Paris Sorbonne, Paris, France