1. Department of Dermatology, University Hospital Miguel Servet, IIS Aragón, Zaragoza, Spain
2. Department of Dermatology, University Hospital Arnau de Vilanova, Lleida, Spain
3. Unit of Dermatology, Hospital San Jorge, Huesca, Spain
4. Medical School, Granada University and Department of Dermatology, Hospital Virgen de las Nieves, Granada, Spain
5. Vielha Hospital, Vielha (Lleida), Spain
6. Medical School, Granada University, Granada, Spain
7. Unit of Dermatology, Hospital de Barbastro, Barbastro, Spain