Accepted for Publication: July 21, 2011.
Author Contributions:Study concept and design: Laforêt, Ørngreen, and Vissing. Acquisition of data: Ørngreen, Preisler, Andersen, and Vissing. Analysis and interpretation of data: Laforêt, Ørngreen, Preisler, and Vissing. Drafting of the manuscript: Laforêt and Ørngreen. Critical revision of the manuscript for important intellectual content: Laforêt, Ørngreen, Preisler, Andersen, and Vissing. Statistical analysis: Ørngreen. Obtained funding: Vissing. Administrative, technical, and material support: Laforêt, Preisler, Andersen, and Vissing. Study supervision: Laforêt.
Financial Disclosure: None reported.