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Acknowledgements
The authors thank Heather Wells for her assistance with processing and analysis of sputum samples. We also thank Jihong Wu for her assistance with gamma scintigraphy procedures related to the study.
Ethics approval and consent to participate
The University of North Carolina Institutional Review Board Biomedical Committee approved the study (#15-1938). Written informed consent was obtained from all participants. This study was registered on clinicaltrials.gov under identifier NCT02911688.
Disclosure statement
The authors declare that they have no competing interests.
Data availability statement
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Additional information
Funding
Research reported in this publication was supported by the National Institute of Environmental Health Sciences of the National Institutes of Health under awards R01ES023349 and P30ES010126 and Assistance Agreement No. 83578501-0 awarded by the U.S. Environmental Protection Agency to the University of North Carolina. MH is supported by R01HL135235. HZ and TW are supported by R01ES021900.