1. From the School of Optometry and
2. the Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, Ontario, Canada; and
3. the Divisions of Pathology,
4. Dentistry,
5. Otolaryngology,
6. Ophthalmology, and
7. Rheumatology, University Health Network, University of Toronto, Toronto, Ontario, Canada.