1. Department of Dermatology; Radboud University Medical Center; Nijmegen The Netherlands
2. Department of Dermatology; University of Bern; Bern Switzerland
3. Centro de Dermatología Epidermis; Porto Portugal
4. Department of Dermatology; University of Ghent; Ghent Belgium
5. Hon. Pr. of the University of Franche-Comté; Nail Disease Center; Cannes France
6. Department of Dermatology, Centre Hospitalier Lyon Sud; Lyon Cancer Research Center (Pr Puisieux); Lyon 1 Claude Bernard University; Lyon France
7. Department of Dermatology, Brugmann, St Pierre and Queen Fabiola University Hospitals; Université Libre de Bruxelles; Belgium