[1] Queens Univ, Dept Emergency Med, Kingston, ON, Canada
[2] Queens Univ, Dept Biomed & Mol Sci, Kingston, ON, Canada
[3] Univ Calgary, Dept Emergency Med, Calgary, AB, Canada
[4] Alberta Hlth Serv, Poison & Drug Informat Serv, Sect Clin Pharmacol & Toxicol, Calgary, AB, Canada
[5] Univ Toronto, Dept Med, Toronto, ON, Canada
[6] Univ Toronto, Dept Pediat, Toronto, ON, Canada
[7] Univ Toronto, Dept Hlth Policy Management & Evaluat, Toronto, ON, Canada
[8] Hosp Sick Children, Ontario Poison Ctr, Toronto, ON, Canada