About the Authors

Matthew Rinehart

matt.rinehart@duke.edu

Affiliation Department of Biomedical Engineering, Duke University, Durham, North Carolina, United States of America

Sheila Grab

Affiliation University of Pittsburgh, School of Pharmacy, Magee Womens Research Institute, Pittsburgh, Pennsylvania, United States of America

Lisa Rohan

Affiliation University of Pittsburgh, School of Pharmacy, Magee Womens Research Institute, Pittsburgh, Pennsylvania, United States of America

David Katz

Affiliations Department of Biomedical Engineering, Duke University, Durham, North Carolina, United States of America, Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina, United States of America

Adam Wax

Affiliation Department of Biomedical Engineering, Duke University, Durham, North Carolina, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MR LR DK AW. Performed the experiments: MR. Analyzed the data: MR. Contributed reagents/materials/analysis tools: LR AW. Wrote the paper: MR SG LR DK AW. Built the imaging refractometry system: MR. Manufactured and characterized film samples: SG.