Author Contributions: Drs Olerud and George and Mr Tiger had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study conception and design: McKenzie and Tran. Acquisition of data: McKenzie, Tran, Olerud, and George. Analysis and interpretation of data: Olerud and George. Drafting of the manuscript: Tiger, McKenzie, Olerud, and George. Critical revision of the manuscript for important intellectual content: Tran, Olerud, and George. Administrative, technical, and material support: Tiger, McKenzie, Olerud, and George. Study supervision: McKenzie, Olerud, and George.