About the Authors

Hyunok Choi

Affiliation Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, United States of America

Norbert Schmidbauer

Affiliation Norwegian Institute for Air Research, Kjeller, Norway

Jan Sundell

Affiliation Department of Building Science, School of Architecture, Tsinghua University, Beijing, China

Mikael Hasselgren

Affiliation Primary Care Research Unit, County Council of Varmland, Karlstad, Sweden

John Spengler

Affiliation Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, United States of America

Carl-Gustaf Bornehag

carl-gustaf.bornehag@kau.se

Affiliations Public Health Sciences, Karlstad University, Karlstad, Sweden, SP Technical Research Institute of Sweden, Boras, Sweden

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.