[1] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[2] Hosp Sick Children, 555 Univ Ave, Toronto, ON M5G 1X8, Canada
[3] McMaster Univ, Psychol Neurosci & Behav, Hamilton, ON, Canada
[4] Univ Toronto, Dept Ophthalmol & Vis Sci, Toronto, ON, Canada
[5] Hosp Sick Children, Child Hlth Evaluat Sci, Res Inst, Toronto, ON, Canada
[6] ICES, Toronto, ON, Canada
[7] Univ Toronto, Dept Pediat, Toronto, ON, Canada