About the Authors

Young U. Ryu

Affiliation Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California, United States of America

Nina S. Bradley

nbradley@usc.edu

Affiliation Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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