About the Authors

Jennifer A. Hobbs

Affiliation Department of Physics and Astronomy, Northwestern University, Evanston, Illinois, United States of America

R. Blythe Towal

Current address: Qualcomm, San Diego, California, United States of America

Affiliation Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, United States of America

Mitra J. Z. Hartmann

hartmann@northwestern.edu

Affiliations Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, United States of America, Department of Mechanical Engineering, Northwestern University, Evanston, Illinois, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JAH RBT MJZH. Performed the experiments: JAH RBT. Analyzed the data: JAH RBT MJZH. Wrote the paper: JAH MJZH.