1. Department of Dermatology; Hospital de Cascais Dr. José de Almeida; Lisbon; Portugal
2. Department of Dermatology; Hospital Infantil Universitario Niño Jesús; Madrid; Spain
3. Department of Dermatology; Fundación Jiménez Díaz; Madrid; Spain
4. Department of Dermatology; Hospital Universitário de Coimbra; Coimbra; Portugal
5. Department of Dermatology; Complexo Hospitalario Universitario A Coruña; Coruña; Spain
6. Department of Dermatology; Consorcio Hospital General Universitário de Valencia; Valencia; Spain
7. Department of Pathology; Hospital Infantil Universitario Niño Jesús; Madrid; Spain