About the Authors

Jiong Li

jl@soci.au.dk

Affiliation Section for Epidemiology, Department of Public Health, Aarhus University, Aarhus, Denmark

Mogens Vestergaard

Affiliations Section for General Practice, Department of Public Health, Aarhus University, Aarhus, Denmark, Research Unit for General Practice, Department of Public Health, Aarhus University, Aarhus, Denmark

Sven Cnattingius

Affiliation Clinical Epidemiology Unit, Department of Medicine, Karolinska Institute, Stockholm, Sweden

Mika Gissler

Affiliation National Institute for Health and Welfare (THL), Helsinki, Finland

Bodil Hammer Bech

Affiliation Section for Epidemiology, Department of Public Health, Aarhus University, Aarhus, Denmark

Carsten Obel

Affiliations Section for General Practice, Department of Public Health, Aarhus University, Aarhus, Denmark, Research Programme for Mental Child Health, Department of Public Health, Aarhus University, Aarhus, Denmark

Jørn Olsen

Affiliations Section for Epidemiology, Department of Public Health, Aarhus University, Aarhus, Denmark, Department of Epidemiology, School of Public Health, University of California, Los Angeles, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JL. Performed the experiments: JL MV SC MG BHB CO JO. Analyzed the data: JL. Contributed reagents/materials/analysis tools: JL MV SC MG BHB CO JO. Wrote the first draft of the manuscript: JL. Contributed to the writing of the manuscript: JL MV SC MG BHB CO JO. ICMJE criteria for authorship read and met: JL MV SC MG BHB CO JO. Agree with manuscript results and conclusions: JL MV SC MG BHB CO JO. Obtained research funding for this study: JL.