About the Authors

Sven Drefahl

sven.drefahl@sociology.su.se

Affiliations Demography Unit, Department of Sociology, Stockholm University, Stockholm, Sweden, Institute of Environmental Medicine, Division of Epidemiology, Karolinska Institutet, Stockholm, Sweden

Anders Ahlbom

Affiliation Institute of Environmental Medicine, Division of Epidemiology, Karolinska Institutet, Stockholm, Sweden

Karin Modig

Affiliation Institute of Environmental Medicine, Division of Epidemiology, Karolinska Institutet, Stockholm, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SD AA KM. Analyzed the data: SD. Wrote the paper: SD AA KM.