About the Authors

Reginald Quansah

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

Maritta S. Jaakkola

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

Timo T. Hugg

Affiliations Center for Environmental and Respiratory Health Research, University of Oulu, Oulu, Finland, Institute of Health Sciences, University of Oulu, Oulu, Finland

Sirpa A M. Heikkinen

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

Jouni J. K. Jaakkola

jouni.jaakkola@oulu.fi

Affiliations Center for Environmental and Respiratory Health Research, University of Oulu, Oulu, Finland, Institute of Health Sciences, University of Oulu, Oulu, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JJ. Performed the experiments: TH SH. Analyzed the data: RQ JJ. Wrote the paper: RQ MJ JJ.