About the Authors

Eli Saastad

eli.saastad@hioa.no

Affiliations Faculty of Health, Nutrition and Management, Oslo and Akershus University College of Applied Sciences, Oslo, Norway, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway

Brita A. Winje

Affiliation Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway

Babill Stray Pedersen

Affiliations Division of Women and Children, Rikshospitalet, Oslo University Hospital, Oslo, Norway, Institute of Clinical Medicine, University of Oslo, Oslo, Norway

J. Frederik Frøen

Affiliation Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ES BSP JFF. Performed the experiments: ES. Analyzed the data: ES BAW JFF. Contributed reagents/materials/analysis tools: N/A. Wrote the paper: ES BAW BSP JFF.