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.