1. Department of Dermatology; University Hospital Leipzig; Leipzig Germany
2. Department of Dermatology; University Hospital Basel; Basel Switzerland
3. Laboratoire de Pathologie; Université Paris Diderot; Paris France
4. Department of Critical Care Medicine and Surgery; University of Florence; Florence Italy
5. Institute of Medical Informatics; Statistics and Epidemiology; University of Leipzig; Leipzig Germany
6. Department of Haematology and Oncology; University of Regensburg; Regensburg Germany
7. Department of Internal Medicine I; Medical University of Vienna; Vienna Austria
8. Department of Dermatology; University Hospital Essen; Essen Germany