About the Authors

Sanna Heikkinen

sanna.heikkinen@cancer.fi

Affiliation Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Unioninkatu 22, FI-00130, Helsinki, Finland

Janne Pitkäniemi

Affiliations Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Unioninkatu 22, FI-00130, Helsinki, Finland, University of Helsinki, Hjelt Institute, Department of Public Health, PO Box 41 (Mannerheimintie 172), FI-00014 University of Helsinki, Helsinki, Finland

Tytti Sarkeala

Affiliation Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Unioninkatu 22, FI-00130, Helsinki, Finland

Nea Malila

Affiliations Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Unioninkatu 22, FI-00130, Helsinki, Finland, School of Health Sciences, University of Tampere, FI-33014 University of Tampere, Tampere, Finland

Markku Koskenvuo

Affiliation University of Helsinki, Hjelt Institute, Department of Public Health, PO Box 41 (Mannerheimintie 172), FI-00014 University of Helsinki, Helsinki, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SH JP MK. Performed the experiments: SH JP. Analyzed the data: SH JP. Wrote the paper: SH JP MK NM TS.