About the Authors

Liselotte Petersen

llp@ncrr.dk

Affiliations National Centre for Register-Based Research, University of Aarhus, Aarhus, Denmark, Institute of Preventive Medicine, Copenhagen University Hospital, Copenhagen, Denmark

Per Kragh Andersen

Affiliation Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark

Thorkild I. A. Sørensen

Affiliation Institute of Preventive Medicine, Copenhagen University Hospital, Copenhagen, Denmark

Competing Interests

TIAS serves on the editorial board of PLoS ONE.

Author Contributions

Conceived and designed the experiments: PKA TIAS. Performed the experiments: PKA TIAS. Analyzed the data: LP. Contributed reagents/materials/analysis tools: LP PKA TIAS. Wrote the paper: LP TIAS.