Author Contributions: Dr Kirsner 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: Newland and Kirsner. Acquisition of data: Newland, Patel, and Kirsner. Analysis and interpretation of data: Newland, Patel, Prieto, Boulton, Pacheco, and Kirsner. Drafting of the manuscript: Newland, Patel, Pacheco, and Kirsner. Critical revision of the manuscript for important intellectual content: Prieto, Boulton, and Kirsner. Statistical analysis: Pacheco. Administrative, technical, and material support: Newland, Patel, and Kirsner. Study supervision: Newland, Prieto, Boulton, and Kirsner.