1. Department of Pediatric Dermatology; University Children's Hospital Zurich; Zurich Switzerland
2. Department of Dermatology; University Hospital Zurich; Zurich Switzerland
3. Servicio de Dermatologia; Hospital de la Santa Creu i Sant Pau; Barcelona Spain
4. Department of Ophthalmology; University Hospital Zurich; Zurich Switzerland
5. Department of Dermatology and Pediatrics; University of California, San Francisco; San Francisco California