Author Contributions: Dr W. Nicholson had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: W. Nicholson, Goldberg, and Schuler. Acquisition of data: W. Nicholson, W. J. Nicholson, Tolerico, Taylor, Solomon, Schryver, McCullum, Mills, Shears, Agarwal, and Tuohy. Analysis and interpretation of data: W. Nicholson, Solomon, McCullum, Siddoway, and Tuohy. Drafting of the manuscript: W. Nicholson, Schuler, and Shears. Critical revision of the manuscript for important intellectual content: W. Nicholson, W. J. Nicholson, Tolerico, Taylor, Solomon, Schryver, McCullum, Goldberg, Mills, Siddoway, Agarwal, and Tuohy. Statistical analysis: W. Nicholson and Tuohy. Obtained funding: W. Nicholson. Administrative, technical, and material support: W. Nicholson, Tolerico, Solomon, McCullum, Schuler, Shears, Siddoway, and Tuohy. Study supervision: W. Nicholson.