[1] Univ Toronto, Joint Ctr Bioeth, Toronto, ON M5T 3M7, Canada
[2] Hosp Sick Children, Dept Bioeth, Toronto, ON, Canada
[3] Univ Toronto, Dept Paediat, Toronto, ON, Canada
[4] Hosp Sick Children, Dept Palliat Care, Toronto, ON, Canada
[5] Univ Toronto, Dept Family & Community Med, Toronto, ON, Canada