1. Department of Dermatology; Hospital Virgen de Valme; Sevilla Spain
2. Department of Dermatology; Hospital Universitario Fundación Jiménez Díaz; Madrid Spain
3. Department of Dermatology; Universitätsklinikum Freiburg; Freiburg Germany
4. Department of Dermatology; Hospital Infantil Niño Jesús; Madrid Spain