Author Contributions:Study concept and design: Mayer, Slymen, Clapp, Elder, Sallis, Eichenfield, and Weinstock. Acquisition of data: Mayer and Pichon. Analysis and interpretation of data: Mayer and Slymen. Drafting of the manuscript: Mayer, Slymen, Clapp, Pichon, Elder, Sallis, Eichenfield, and Weinstock. Critical revision of the manuscript for important intellectual content: Mayer. Statistical analysis: Slymen. Obtained funding: Mayer, Elder, and Sallis. Administrative, technical, and material support: Clapp. Study supervision: Clapp and Pichon.