1. Department of Pediatrics Faculty of Medicine and University Hospital Cologne University of Cologne Cologne Germany
2. Department of Pediatrics Children’s Hospital Sankt Augustin Sankt Augustin Germany
3. Department of Pediatrics Medizinische Fakultät Carl Gustav Carus Technische Universität Dresden Dresden Germany
4. Department of Dermatology Hospital Infantil Universitario Niño Jesús Universidad Autónoma de Madrid Madrid Spain
5. Department of Dermatology Faculty of Medicine and University Hospital Cologne University of Cologne Cologne Germany