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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Satvinder Ghotra analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Jessie-Lee D McIsaac conceived and designed the experiments, wrote the paper, reviewed drafts of the paper.

Sara FL Kirk conceived and designed the experiments, reviewed drafts of the paper.

Stefan Kuhle conceived and designed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Human Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Ethics approval for this study was obtained from the Health Research Ethics Boards at the Dalhousie University (Protocol # 2013-3094). The permission for data collection was also granted from the participating school board and individual schools. Written informed consent was obtained from the parents of all children included in the study.

Funding

This work was supported by the Canadian Institutes of Health Research [FRN 127082]. Sara Kirk holds a CIHR Canada Research Chair in Health Services Research. Jessie-Lee McIsaac was supported by a postdoctoral fellowship from KT Canada and CIHR as well as a Bright Red Graduate Research Award from the Heart and Stroke Foundation of Canada. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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