1. Department of Dermatology, Saint‐Pierre Brugmann and Queen Fabiola Children's University Hospitals, Université Libre de Bruxelles Brussels Belgium
2. Department of Dermatopathology, Saint‐Pierre Hospital Université Libre de Bruxelles Brussels Belgium
3. Departments of Dermatology and Pathology Oregon Health and Science University Portland Oregon USA
4. CTA Pathology Portland Oregon USA
5. Laboratory of Stem Cells and Cancer Université Libre de Bruxelles Brussels Belgium