About the Authors

Melissa A. Badding

mbadding@cdc.gov

Affiliation Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, 26505, United States of America

Diane Schwegler-Berry

Affiliation Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, 26505, United States of America

Ju-Hyeong Park

Affiliation Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, Morgantown, WV, 26505, United States of America

Natalie R. Fix

Affiliation Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, 26505, United States of America

Kristin J. Cummings

Affiliation Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, Morgantown, WV, 26505, United States of America

Stephen S. Leonard

Affiliation Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, 26505, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MAB. Performed the experiments: MAB DSB JHP NRF. Analyzed the data: MAB JHP. Contributed reagents/materials/analysis tools: DSB JHP KJC SSL. Wrote the paper: MAB.