Submitted for Publication: September 21, 2014; final revision received December 17, 2014; accepted December 20, 2014.
Published Online: February 26, 2015. doi:10.1001/jamaophthalmol.2015.38.
Study concept and design: R. J. Campbell, ten Hove, El-Defrawy.
Acquisition, analysis, or interpretation of data: R. J. Campbell, Gill, El-Defrawy, Strube, Whitehead, E. de L. P. Campbell, Bell.
Drafting of the manuscript: R. J. Campbell.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: R. J. Campbell, Whitehead, E. de L. P. Campbell.
Obtained funding: R. J. Campbell.
Administrative, technical, or material support: El-Defrawy, Whitehead, E. de L. P. Campbell.
Study supervision: R. J. Campbell, Strube, Bell.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This study was supported by Canadian Institutes of Health Research New Investigator Award from the Institute of Aging (Dr Gill), a Canadian Institutes of Health Research and Canadian Patient Safety Institute chair in Patient Safety and Continuity of Care (Dr Bell), and the Institute for Clinical Evaluative Sciences, which is funded by an annual grant from the Ontario Ministry of Health and Long-term Care.
Role of the Funder/Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and the decision to submit for publication.
Disclaimer: The opinions, results, and conclusions reported in this article are those of the authors and are independent from the funding sources. No endorsement by the Institute for Clinical Evaluative Sciences or the Ontario Ministry of Health and Long-term Care is intended or should be inferred.
Additional Information: In accordance with the Personal Health Information Protection Act of Ontario, the raw administrative data used for statistical analysis in the manuscript may only be accessed by agents of the Institute for Clinical Evaluative Sciences, a prescribed entity under Section 45 of the Act, for the purposes of conducting research that contributes to the effectiveness, quality, equity, and efficiency of health care and health services. Dr R. J. Campbell is an agent of the Institute for Clinical Evaluative Sciences and had full control of the data definitions and analyses used in the manuscript.