1. Department of Dermatology; University Freiburg Medical Centre; Freiburg Germany
2. Department of Paediatrics; Hospital for Sick Children; Toronto Ontario Canada
3. Department of Dermatology; Stanford School of Medicine; Redwood City California
4. Division of Dermatology; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio
5. Department of Dermatology; University of Colorado School of Medicine; Aurora Colorado
6. Department of Pediatrics; University of Colorado School of Medicine; Aurora Colorado