About the Authors
Mathematical Institute, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
Leibniz Research Centre for Working Environment and Human Factors (IfADo), Dortmund, Germany
Faculty of Statistics, TU Dortmund University, Dortmund, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JGH KG HS SS KI RM. Performed the experiments: MB. Analyzed the data: HS SS. Wrote the paper: JGH KG HS SS RM MB KI.