1. Departments of Dermatology and Pediatrics Northwestern University Feinberg School of Medicine Chicago Illinois USA
2. Department of Pediatrics Northwestern University Feinberg School of Medicine Chicago Illinois USA
3. University of Rochester Medical Center Rochester New York USA
4. Oregon Medical Research Center Portland Oregon USA
5. Departments of Pediatrics and Dermatology Saint Louis University School of Medicine St. Louis Missouri USA
6. Sheffield Dermatology Research University of Sheffield Sheffield UK
7. Department of Dermatology and Allergy University Hospital Ludwig‐Maximilian University Munich Germany
8. Regeneron Pharmaceuticals Inc Tarrytown New York USA
9. Sanofi‐Genzyme Cambridge Massachusetts USA