About the Authors

Frank T. J. M. Zaal, Raoul M. Bongers
Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Corresponding Author

f.t.j.m.zaal@umcg.nl

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: FZ RB. Performed the experiments: FZ. Analyzed the data: FZ. Contributed reagents/materials/analysis tools: FZ. Wrote the paper: FZ RB.