About the Authors

Hyunok Choi, John Spengler
Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, United States of America

Norbert Schmidbauer
Norwegian Institute for Air Research, Kjeller, Norway

Jan Sundell
Department of Building Science, School of Architecture, Tsinghua University, Beijing, China

Mikael Hasselgren
Primary Care Research Unit, County Council of Varmland, Karlstad, Sweden

Carl-Gustaf Bornehag
Public Health Sciences, Karlstad University, Karlstad, Sweden

Carl-Gustaf Bornehag
SP Technical Research Institute of Sweden, Boras, Sweden

Corresponding Author

carl-gustaf.bornehag@kau.se

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JS CGB. Performed the experiments: NS JS MH. Analyzed the data: HC JS. Contributed reagents/materials/analysis tools: NS MH JS. Wrote the paper: HC NS MH CGB.