1 Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada.
2 Division of Paediatric Surgery, Children's Hospital London Health Sciences Centre, London, Ontario, Canada.
3 Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada; Division of Paediatric Surgery, Children's Hospital London Health Sciences Centre, London, Ontario, Canada.
4 Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada; Department of Otolaryngology - Head and Neck Surgery, Western University, London, Ontario, Canada. Electronic address: julie.strychowsky@lhsc.on.ca.