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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

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

Jillian Ashley-Martin conceived and designed the experiments, wrote the paper, reviewed drafts of the paper.

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

David C Hamilton conceived and designed the experiments, analyzed the data, reviewed drafts of the paper.

Human Ethics

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

All processes used for cycles 1 and 2 of the CHMS were reviewed and approved by the Health Canada Research Ethics Board to ensure that internationally recognized ethical standards for human research were met and maintained. Written informed consent was obtained from all participants aged 14 years and older; parents or guardians gave consent on behalf of children aged 6 to 13 years, while the child provided his or her assent to participate. The current project was approved by the IWK Health Centre Research Ethics Board, Halifax, NS, Canada (File # 1014413).

Data Deposition

The following information was supplied regarding data availability:

Data are only available through the Statistics Canada Research Data Centres for researchers who meet the criteria for access to confidential data.

Application process is at http://www.statcan.gc.ca/eng/rdc/process.

Researchers submit an application form and project proposal to the Statistics Canada Research Data Centres Program. Upon approval they have to undergo a security check. Once completed they get access to one of the Research Data Centres in Canada to analyze the data. All output produced at the centres must be vetted by a Statistics Canada analyst before it is released to the researcher for publication.

Funding

This work was supported by an IWK Health Centre (http://www.iwk.nshealth.ca) Establishment Grant awarded to Dr. Stefan Kuhle (#09020) and an IWK Health Centre Research Associate Award awarded to Dr. Jillian Ashley-Martin (#18396). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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