About the Authors

Hanneke Bouwsema

r.m.bongers@umcg.nl

Affiliation University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Groningen, The Netherlands

Corry K. van der Sluis

Affiliation University Medical Center Groningen, Center for Rehabilitation, Groningen, The Netherlands

Raoul M. Bongers

Affiliation University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Groningen, The Netherlands

Competing Interests

The research was performed while the first author, Hanneke Bouwsema, was financially supported by Otto Bock Healthcare GmbH, Vienna, Austria. By legal contract Otto Bock had no influence on the interpretation of the results and the wording in the manuscript. The authors confirm that this does not alter their adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: HB CKS RMB. Performed the experiments: HB. Analyzed the data: HB RMB. Contributed reagents/materials/analysis tools: HB RMB. Wrote the paper: HB CKS RMB.