Author Contributions: Dr Davis and Mr Gardner had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Gardner, Davis, Richardson, and Pittelkow. Acquisition of data: Gardner, Davis, Richardson, and Pittelkow. Analysis and interpretation of data: Gardner, Davis, and Pittelkow. Drafting of the manuscript: Gardner, Davis, and Pittelkow. Critical revision of the manuscript for important intellectual content: Davis, Richardson, and Pittelkow. Obtained funding: Davis. Administrative, technical, and material support: Gardner, Davis, and Richardson. Study supervision: Davis and Pittelkow.