Accepted for Publication: August 3, 2012.
Published Online: January 7, 2013. doi:10.1001/2013.jamapediatrics.216
Author Contributions: Drs Zemek and Farion had access to all data and take responsibility for the integrity of the study. Study concept and design: Zemek, Farion, and Sampson. Acquisition of data: Zemek, Farion, Sampson, and McGahern. Analysis and interpretation of data: Zemek and Farion. Drafting of the manuscript: Zemek, Farion, and McGahern. Critical revision of the manuscript for important intellectual content: Zemek, Farion, Sampson, and McGahern. Statistical analysis: Zemek. Obtained funding: Zemek and Farion. Administrative, technical, and material support: Sampson and McGahern. Study supervision: Zemek.
Conflict of Interest Disclosures: None reported.
Funding/Support: This review was funded by a grant from the Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.
Additional Contributions: We thank Ruth Foxlee, BA, for peer reviewing the electronic search strategies and Erin Crouchman, MSc, for editorial review of the manuscript. Keith Yeates, PhD, cooperated with our request for additional information.