About the Authors

Ulla Haverinen-Shaughnessy

Contributed equally to this work with: Ulla Haverinen-Shaughnessy, Richard J. Shaughnessy

Affiliations Indoor Air Program, the University of Tulsa, 600 S College Ave, Tulsa, OK, 74104, United States of America, National Institute for Health and Welfare, Department of Health Protection, P.O. Box 95, 70701, Kuopio, Finland

Richard J. Shaughnessy

Contributed equally to this work with: Ulla Haverinen-Shaughnessy, Richard J. Shaughnessy

rjstulsau@aol.com

Affiliation Indoor Air Program, the University of Tulsa, 600 S College Ave, Tulsa, OK, 74104, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: UHS RJS. Performed the experiments: UHS RJS. Analyzed the data: UHS RJS. Contributed reagents/materials/analysis tools: UHS RJS. Wrote the paper: UHS RJS.