[1] Univ Toronto, Univ Hlth Network, Div Crit Care, Toronto, ON, Canada
[2] Univ Toronto, Univ Hlth Network, Div Palliat Care, Toronto, ON, Canada
[3] Univ Western Ontario, London Hlth Sci Ctr, Dept Eth, London, ON, Canada
[4] Univ Alberta, Fac Med & Dent, John Dossetor Hlth Eth Ctr, Edmonton, AB, Canada
[5] Univ Alberta, Fac Med & Dent, Dept Psychiat, Edmonton, AB, Canada
[6] Univ Toronto, Hosp Sick Children, Dept Crit Care, Toronto, ON M5G 1X8, Canada
[7] Univ Toronto, Hosp Sick Children, Dept Anesthesia, Toronto, ON M5G 1X8, Canada