Submitted for Publication: February 19, 2011; final revision received April 7, 2011; accepted May 7, 2011.
Author Contributions: Dr Haggstrom had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Haggstrom, Drolet, Holland, and Matt. Acquisition of data: Haggstrom, Skillman, Garzon, Drolet, Holland, Matt, McCuaig, Metry, Morel, Powell, and Frieden. Analysis and interpretation of data: Haggstrom, Skillman, Metry, and Frieden. Drafting of the manuscript: Haggstrom, Skillman, and McCuaig. Critical revision of the manuscript for important intellectual content: Haggstrom, Garzon, Drolet, Holland, Matt, McCuaig, Metry, Morel, Powell, and Frieden. Statistical analysis: Drolet. Administrative, technical, and material support: Haggstrom, Skillman, Drolet, Matt, and McCuaig. Study supervision: Haggstrom.
Financial Disclosure: Dr Frieden serves as a consultant to Pierre-Fabre.