1 Department of Dermatology, Mastocytosis Expert Center of Midi-Pyrénées, Toulouse University Hospital, Paul Sabatier University, Toulouse, France.
2 Department of Pathology, Mastocytosis Expert Center of Midi-Pyrénées, Institut Universitaire du Cancer, Toulouse Oncopole, University of Toulouse III Paul Sabatier, Toulouse, France.
3 USMR Support Unit for Research Methodology, Department of Epidemiology, Toulouse University Hospital, Toulouse, France.
4 Department of Hematology, CEREMAST, Necker Hospital, Paris-APH, Paris, France.