Accepted for Publication: September 13, 2010.
Author Contributions: Study concept and design: Roberts and Ball. Acquisition of data: Roberts, Ball, and Tiruta. Analysis and interpretation of data: Roberts, Ball, and Kirkpatrick. Drafting of the manuscript: Roberts and Ball. Critical revision of the manuscript for important intellectual content: Roberts, Ball, Tiruta, and Kirkpatrick. Statistical analysis: Ball and Tiruta. Obtained funding: Ball. Administrative, technical, and material support: Roberts, Ball, and Kirkpatrick. Study supervision: Ball.
Financial Disclosure: None reported.
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