1 Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
2 Harley Street Institute, London, United Kingdom.
3 Section of Dermatology, Division of Pediatric Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada; Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada.
4 Department of Radiology, Vancouver General Hospital, Vancouver, British Columbia, Canada. Electronic address: fkhosa@hotmail.com.