About the Authors

Chun S. Wu

cw@soci.au.dk

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

Ellen A. Nohr

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

Bodil H. Bech

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

Mogens Vestergaard

Affiliations Research Unit for General Practice, Aarhus University, Aarhus, Denmark, Section for General Practice, 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, 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: JO CSW EAN BHB MV. Analyzed the data: CSW. Wrote the paper: CSW. Supervised the study: JO EAN BHB. Contributed interpretation of the result and revision of the manuscript: CSW EAN BHB MV JO.