Author Contributions: Dr Kaderli had full access to all of 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: Kaderli, Fahrner, and Beldi. Acquisition of data: Kaderli and Beldi. Analysis and interpretation of data: Kaderli, Fahrner, Beldi, Patak, and Candinas. Drafting of the manuscript: Kaderli and Beldi. Critical revision of the manuscript for important intellectual content: Kaderli, Fahrner, Beldi, Patak, and Candinas. Administrative, technical, and material support: Fahrner and Patak. Study supervision: Beldi and Candinas.