Accepted for Publication: September 9, 2011.
Author Contributions:Study concept and design: Crichlow, Jaffe, and Bellows. Acquisition of data: Crichlow and Bellows. Analysis and interpretation of data: Crichlowand Bellows. Drafting of the manuscript: Crichlow, Jaffe, and Bellows. Critical revision of the manuscript for important intellectual content: Crichlow, Jaffe, and Bellows. Administrative, technical, and material support: Bellows. Study supervision: Jaffe and Bellows.
Financial Disclosure: None reported.