About the Authors

Edward M. Fisher

EFisher@cdc.gov

Affiliation National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, Pennsylvania, United States of America

Jessica L. Williams

Affiliation National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, Pennsylvania, United States of America

Ronald E. Shaffer

Affiliation National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: EMF RES. Performed the experiments: JLW EMF. Analyzed the data: EMF JLW RES. Wrote the paper: EMF JLW RES.