About the Authors

Adalbjorg Kristbjornsdottir

Affiliation Centre of Public Health Sciences, University of Iceland, Reykjavik, Iceland

Thor Aspelund

Affiliation Centre of Public Health Sciences, University of Iceland, Reykjavik, Iceland

Vilhjalmur Rafnsson

vilraf@hi.is

Affiliation Department of Preventive Medicine, Faculty of Medicine, University of Iceland, Reykjavik, Iceland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AK TA VR. Performed the experiments: AK TA VR. Analyzed the data: AK TA VR. Wrote the paper: AK TA VR.