1. Department of Dermatology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
2. Department of Dermatology, Ghent University Hospital, Gent, Belgium
3. Jan van Breemen Research Institute/Reade, Amsterdam, the Netherlands4Sanquin Research and Landsteiner Laboratory, Department of Immunopathology, Academic Medical Centre, University of Amsterdam, Amsterdam, the Netherlands
4. Department of Dermatology, Radboud University Medical Center, Nijmegen, the Netherlands
5. Department of Dermatology, Maria Middelares Hospital, Gent, Belgium
6. Department of Dermatology, H Hart Ziekenhuis, Mol, Belgium