Author Contributions:Study concept and design: Gopinath and Mitchell. Acquisition of data: Mitchell. Analysis and interpretation of data: Gopinath, Rochtchina, and Flood. Drafting of the manuscript: Gopinath. Critical revision of the manuscript for important intellectual content: Rochtchina, Flood, and Mitchell. Statistical analysis: Rochtchina. Obtained funding: Mitchell. Administrative, technical, and material support: Gopinath, Flood, and Mitchell. Study supervision: Gopinath and Mitchell.