1. Division of Critical Care Medicine, Department of Pediatrics, Stollery Children’s Hospital, University of Alberta, Edmonton, Alberta, Canada.
2. Division of Otolaryngology, Department of Surgery, University of Alberta, Edmonton, Alberta, Canada.
3. Department of Pediatric Radiology, Department of Diagnostic Radiology, Stollery Children’s Hospital, University of Alberta, Edmonton, Alberta, Canada.
4. Department of Pediatric Critical Care Medicine, The Children’s Hospital of Winnipeg, University of Manitoba, Winnipeg, Manitoba, Canada.