About the Authors

Stephen M. Cain

smcain@umich.edu

Affiliation Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan, United States of America

James A. Ashton-Miller

Affiliations Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan, United States of America, Department of Biomedical Engineering, The University of Michigan, Ann Arbor, Michigan, United States of America, School of Kinesiology, The University of Michigan, Ann Arbor, Michigan, United States of America

Noel C. Perkins

Affiliation Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SMC JAAM NCP. Performed the experiments: SMC. Analyzed the data: SMC. Contributed reagents/materials/analysis tools: SMC JAAM NCP. Wrote the paper: SMC JAAM NCP.