About the Authors

Erich Dolejsi

Affiliation Center for Medical Statistics, Informatics, and Intelligent Systems/Section of Medical Statistics, Medical University Vienna, Vienna, Austria

Bernhard Bodenstorfer

Affiliation cogiti e.U., Karlstift, Austria

Florian Frommlet

Florian.Frommlet@meduniwien.ac.at

Affiliation Center for Medical Statistics, Informatics, and Intelligent Systems/Section of Medical Statistics, Medical University Vienna, Vienna, Austria

Competing Interests

The co-author Bernhard Bodenstorfer runs the company cogiti e.U., which provides information technology services such as programming, consultancy and technology management. However, this does not alter the authors' adherence to PLOS ONE policies on sharing data and materials. In particular, the program developed has been openly published on sourceforge.net under the GNU GPL version 3 open license for the scientific community to freely use, as the authors have indicated in their submitted paper.

Author Contributions

Conceived and designed the experiments: ED BB FF. Performed the experiments: ED. Analyzed the data: ED. Contributed reagents/materials/analysis tools: ED BB FF. Contributed to the writing of the manuscript: ED BB FF.