[1] Queens Univ, Sch Med, 15 Arch St, Kingston, ON K7L 3L4, Canada
[2] Univ Toronto, Temerty Sch Med, Toronto, ON, Canada
[3] Univ Toronto, Temerty Sch Med, Dept Ophthalmol, Toronto, ON, Canada
[4] Univ Toronto, Hosp Sick Children, Div Pediat Dermatol, Toronto, ON, Canada