1. Department of Dermatology University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine Cleveland Ohio USA
2. Department of Dermatology University of California San Francisco San Francisco California USA
3. Hospital de la Santa Creu i Sant Pau Barcelona Spain
4. Division of Dermatology, Department of Pediatrics Sainte‐Justine University Hospital Center, University of Montreal Montreal Quebec Canada
5. Departments of Dermatology and Pediatrics Columbia University New York New York USA
6. Departments of Pediatrics and Dermatology Feinberg School of Medicine, Northwestern University and Ann and Robert H. Lurie Children's Hospital of Chicago Chicago Illinois USA
7. Pediatric Dermatology Clinica Dermik Barcelona Spain