Author Contributions:Study concept and design: Kimmel and Metlay. Acquisition of data: Kimmel and Price. Analysis and interpretation of data: Kimmel, Chen, Price, Parker, Christie, Brensinger, Newcomb, Samaha, and Gross. Drafting of the manuscript: Kimmel, Christie, and Samaha. Critical revision of the manuscript for important intellectual content: Kimmel, Chen, Price, Parker, Metlay, Christie, Brensinger, Newcomb, and Gross. Statistical analysis: Chen, Brensinger, and Newcomb. Obtained funding: Kimmel. Administrative, technical, and material support: Price, Christie, Samaha, and Gross. Study supervision: Kimmel.