1 Department of Dermatology, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille University, Marseille, France. Electronic address: michael.benzaquen@ap-hm.fr.
2 Department of Dermatology, Inselspital-Bern University Hospital, Switzerland.
3 Department of Dermatology, Inselspital-Bern University Hospital, Switzerland; Centro Studi GISED, Bergamo, Italy.
4 Department of Dermatology, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille University, Marseille, France.