About the Authors

Unnur Valdimarsdóttir, Christina M Hultman, Sven Cnattingius, Pär Sparén
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Unnur Valdimarsdóttir
Centre of Public Health Sciences, Faculty of Medicine, University of Iceland, Reykjavík, Iceland

Christina M Hultman
Department of Neuroscience, Psychiatry, Ulleråker, Uppsala University, Uppsala, Sweden

Bernard Harlow
Department of Epidemiology and Community Health, University of Minnesota School of Public Health, Minneapolis, Minnesota, United States of America

Corresponding Author

unnurav@hi.is

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

All authors (UV, CMH, BH, SC, PS) participated in the planning, conception of research questions, and design of the study. PS was responsible retrieving the data/localizing the dataset, and PS and UV were responsible for analyzing the data. UV drafted the article and all authors participated in interpreting data and critically revising the manuscript for important intellectual content. The final version to be published has been approved by all the authors.