About the Authors

Aino Rantala

Affiliation Center for Environmental and Respiratory Health Research, University of Oulu, Oulu, Finland

Jouni J. K. Jaakkola

Affiliations Center for Environmental and Respiratory Health Research, University of Oulu, Oulu, Finland, Public Health, Institute of Health Sciences, University of Oulu, Oulu, Finland, Respiratory Medicine Unit, Department of Medicine, Oulu University Hospital, Oulu, Finland

Maritta S. Jaakkola

maritta.jaakkola@oulu.fi

Affiliations Center for Environmental and Respiratory Health Research, University of Oulu, Oulu, Finland, Respiratory Medicine Unit, Department of Medicine, Oulu University Hospital, Oulu, Finland, Respiratory Medicine Unit, Institute of Clinical Medicine, University of Oulu, Oulu, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MSJ JJKJ. Analyzed the data: AR. Contributed reagents/materials/analysis tools: JJKJ MSJ. Wrote the paper: AR JJKJ MSJ.