About the Authors

Johanna M. Kallio

Affiliation Department of Chemistry, University of Joensuu, Joensuu, Finland

Nina Hakulinen

Affiliation Department of Chemistry, University of Joensuu, Joensuu, Finland

Juha P. Kallio

Affiliation Department of Chemistry, University of Joensuu, Joensuu, Finland

Merja H. Niemi

Affiliation Department of Chemistry, University of Joensuu, Joensuu, Finland

Susanna Kärkkäinen

Affiliation Department of Chemistry, University of Joensuu, Joensuu, Finland

Juha Rouvinen

juha.rouvinen@joensuu.fi

Affiliation Department of Chemistry, University of Joensuu, Joensuu, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JMK NH JPK MHN JR. Performed the experiments: JMK NH JPK MHN SK. Analyzed the data: JMK NH JPK MHN. Wrote the paper: JMK NH JPK MHN JR.