1 Department of Surgery, The Hospital for Sick Children, Toronto, Ontario, Canada Department of Surgery, University of Toronto, Toronto, Ontario, Canada Department of Bioethics, The Hospital for Sick Children, Toronto, Ontario, Canada Department of Paediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada Joint Centre for Bioethics, University of Toronto, Toronto, Ontario, Canada Department of Ophthalmology and Vision Sciences, The Hospital for Sick Children, Toronto, Ontario, Canada Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada.