[1] Univ Toronto, Dept Ophthalmol & Vis Sci, Toronto, ON, Canada
[2] St Michaels Hosp, Dept Ophthalmol, 30 Bond St,7th Floor Donnelly Wing Eye Clin, Toronto, ON M5B 1W8, Canada
[3] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[4] Publ Hlth Ontario, Toronto, ON, Canada
[5] St Michaels Hosp, Div Infect Dis, Toronto, ON, Canada
[6] St Michaels Hosp, MAP Ctr Urban Hlth Solut, Toronto, ON, Canada
[7] Univ Toronto, Dept Med, Toronto, ON, Canada