1. Department of Pediatrics, Children’s Hospital at London Health Science Centre, University of Western Ontario, London, Ontario, Canada
2. Pediatric Dermatology Section, National Children Hospital, San José, Costa Rica
3. Division of Dermatology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
4. Department of General Pathology, McMaster University, Hamilton, Ontario, Canada
5. Division of Dermatology, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada