1. Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania Hospital of the University of Pennsylvania Philadelphia Pennsylvania USA
2. Section of Pediatric Dermatology Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
3. Department of Dermatology Chonnam National University Medical School Gwangju South Korea
4. Department of Dermatology Inselspital University of Berne Bern Switzerland
5. Private Dermatology Practice Dermaticum Freiburg im Breisgau Germany