About the Authors

Michael Sherback

sherback@idsc.mavt.ethz.ch

Affiliation Institute for Dynamic Systems and Control, ETH-Zurich, Zurich, Switzerland

Francisco J. Valero-Cuevas

Affiliations Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California, United States of America, Department of Biomedical Engineering, University of Southern California, Los Angeles, California, United States of America

Raffaello D'Andrea

Affiliation Institute for Dynamic Systems and Control, ETH-Zurich, Zurich, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MS RD. Performed the experiments: MS. Analyzed the data: MS FJVC RD. Contributed reagents/materials/analysis tools: MS. Wrote the paper: MS.