1. Marsico Lung Institute, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, United States
2. Center for Environmental Medicine, Asthma, and Lung Biology, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, United States
3. Department of Environmental Sciences and Engineering, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, United States
4. Department of Pediatrics, Microbiology and Immunology, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, United States
5. Joint Department of Biomedical Engineering, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, United States
6. Department of Physics and Astronomy, UNC Chapel Hill , Chapel Hill, NC 27599, United States