1. EpidStat Institute; Ann Arbor MI USA
2. Department of Clinical Epidemiology; Aarhus University; Aarhus Denmark
3. Mastocytosis Centre Odense University Hospital (MastOUH); Odense Denmark
4. Department of Hematology; Odense University Hospital; Odense Denmark
5. Department of Pathology; Odense University Hospital; Odense Denmark
6. Department of Dermatology and Allergy Centre; Odense University Hospital; Odense Denmark