Accepted for Publication: November 30, 2010.
Author Contributions: Drs Schmidt and Zerr had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Schmidt, Korth, and Zerr. Acquisition of data: Schmidt, Wolff, Weitz, and Zerr. Analysis and interpretation of data: Schmidt, Weitz, Bartlau, and Korth. Drafting of the manuscript: Schmidt, Weitz, Bartlau, and Zerr. Critical revision of the manuscript for important intellectual content: Schmidt, Wolff, Bartlau, Korth, and Zerr. Obtained funding: Zerr. Administrative, technical, and material support: Schmidt, Wolff, Weitz, and Zerr. Study supervision: Schmidt, Korth, and Zerr.
Financial Disclosure: None reported.