1. Department of Dermatology University Hospital Zurich Switzerland
2. Dermatology Service Cantonal Hospital Frauenfeld Switzerland
3. Division of Dermatology Lucerne Cantonal Hospital and Cancer Center Lucerne Switzerland
4. Department of Medical Biosciences/Pathology Umeå University Umeå Sweden
5. Sikl's Department of Pathology, Medical Faculty in Pilsen Charles University in Prague Pilsen Czech Republic
6. Kempf & Pfaltz Histologische Diagnostik Zurich Switzerland