1. Department of Dermatology; Sophia Children's Hospital; Erasmus MC University Medical Centre Rotterdam; Rotterdam The Netherlands
2. Department of Dermatology and Allergology; University Medical Centre Utrecht; Utrecht The Netherlands
3. Swiss Institute of Allergy and Asthma Research (SIAF); University of Zürich; Davos Switzerland
4. Department of Medical Microbiology and Infectious Diseases; Sophia Children's Hospital; Erasmus MC University Medical Centre Rotterdam; Rotterdam The Netherlands
5. Department of Paediatric Dermatology; Sophia Children's Hospital; Erasmus MC University Medical Centre Rotterdam; Rotterdam The Netherlands