Submitted for Publication: April 29, 2011; final revision received October 15, 2011; accepted December 6, 2011.
Author Contributions: Drs Fruth and Zhu contributed equally to this work. Drs Fruth and Brieger and Ms Schneider had full access to all the data in the study and take full responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Fruth and Brieger. Acquisition of data: Fruth, Zhu, Schramek, Angermair, Kassem, and Mann. Analysis and interpretation of data: Fruth, Zhu, Schramek, Haxel, Schneider, and Brieger. Drafting of the manuscript: Fruth, Zhu, Angermair, and Kassem. Critical revision of the manuscript for important intellectual content: Fruth, Schramek, Haxel, Schneider, Mann, and Brieger. Statistical analysis: Fruth, Schramek, and Schneider. Obtained funding: Brieger. Administrative, technical, and material support: Fruth, Haxel, and Brieger. Study supervision: Fruth, Mann, and Brieger.
Financial Disclosure: None reported.
Additional Information: Data will be included in part in the doctorial theses of Messrs Schramek, Angermair, and Kassem.
Additional Contributions: Karin Backes provided excellent technical support.