1 Departments of Medicine, Pediatrics, and Health Policy, Management and Evaluation (Juurlink), University of Toronto; Ontario Poison Centre (De Halleux, Juurlink); Sunnybrook Research Institute (Juurlink), Toronto, Ont.; ICES (Juurlink), Toronto, Ont.; Centre Antipoison du Québec (De Halleux), Québec, Que.
2 Departments of Medicine, Pediatrics, and Health Policy, Management and Evaluation (Juurlink), University of Toronto; Ontario Poison Centre (De Halleux, Juurlink); Sunnybrook Research Institute (Juurlink), Toronto, Ont.; ICES (Juurlink), Toronto, Ont.; Centre Antipoison du Québec (De Halleux), Québec, Que. david.juurlink@ices.on.ca.