Accepted for Publication: October 3, 2011.
Author Contributions: All authors had full access to all the data presented in this manuscript and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Kerl, Kempf, Spallone, and Dummer. Acquisition of data: Kerl, Kempf, Braun, Wiesner, and Dummer. Analysis and interpretation of data: Kerl, Kempf, Kamarashev, Braun, Wiesner, French, and Dummer. Drafting of the manuscript: Kerl, Kempf, and Spallone. Critical revision of the manuscript for important intellectual content: Kempf, Kamarashev, Braun, Wiesner, French, and Dummer. Obtained funding: Dummer. Administrative, technical, and material support: Kempf, Wiesner, and Dummer. Study supervision: Spallone, French, and Dummer.
Financial Disclosure: None reported.
Funding/Support: This study was supported in part by the Gottfried and Julia Bangerter-Rhyner-Stiftung and G + B Schwyzer Stiftung.