About the Authors

Patricia A. Janssen

patti.janssen@ubc.ca

Affiliations School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada, Child and Family Research Institute, Vancouver, British Columbia, Canada

Craig Mitton

Affiliations School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada, Centre for Clinical Epidemiology and Evaluation, Vancouver, British Columbia, Canada

Jaafar Aghajanian

Affiliation BC Centre for Epidemiologic and International Ophthalmology, Vancouver, British Columbia, Canada

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PJ CM. Performed the experiments: PJ JA. Analyzed the data: PJ JA. Wrote the paper: PJ JA CM. Obtained data from Population Data BC: PJ FA.