1. Department of Dermatology; Hospital de la Santa Creu i Sant Pau; Barcelona Spain
2. Department of Dermatology; Clínica Dermatológica Internacional; Madrid Spain
3. Departments of Dermatology and Pediatrics; University of California; San Francisco California USA
4. Department of Dermatology; Hospital Son Espases; Mallorca Spain
5. Department of Dermatology; Clínica Universitaria de Navarra; Pamplona Spain
6. Pediatric and Adolescent Department of Dermatology; University of California at San Diego and Rady Children's Hospital; San Diego CA USA