1. Department of Dermatology and Reference Center for Genodermatoses and Rare Skin Diseases; University Paris Descartes - Sorbonne Paris Cité; Institut Imagine; Paris France
2. Universitaets-Hautklinik; Freiburg Germany
3. Division of Dermatology, Department of Experimental, Diagnostic and Specialty Medicine; University of Bologna; Bologna Italy
4. Hon. Pr. of the University of Franche-Comté; Nail Disease Centre; Cannes France