1. Department of Medical Sciences, Section of Dermatology, University of Turin , Turin , Italy
2. Dermatology Department, Coimbra University Hospital Center , Coimbra , Portugal
3. Clinic for Dermatology, Venerology and Allergology, Charité – Universitätsmedizin Berlin, Joint Faculty of Medicine of Freie Universität Berlin and Humboldt-Universität Berlin , Berlin , Germany
4. Hematology Department, University of Ancona, Azienda Ospedaliera Universitaria Ospedali Riuniti di Ancona , Ancona , Italy
5. Department of Hematology, Hospital Clínic de Barcelona , Barcelona , Spain
6. Department of Dermatology, University Hospitals Birmingham NHS Foundation Trust , Birmingham , UK
7. Department of Pathology and
8. Dermatology Unit, AOU Maggiore della Carità , Novara , Italy
9. Department of Dermatology, Hôpital Saint Louis, Université Paris Cité , INSERM U976, Paris , France
10. University Department of Dermatology, Venereology, Allergology and Phlebology, Skin Cancer Center, Johannes Wesling Medical Centre Minden, Ruhr University Bochum , Bochum , Germany
11. Department of Dermatology, Leiden University Medical Centre , Leiden , the Netherlands