About the Authors

Martina Persson

Martina.Persson@ki.se

Affiliation Clinical Epidemiology Unit, Department of Medicine–Solna, Karolinska Institutet, Stockholm, Sweden

Stefan Johansson

Affiliations Clinical Epidemiology Unit, Department of Medicine–Solna, Karolinska Institutet, Stockholm, Sweden, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden

Sven Cnattingius

Affiliation Clinical Epidemiology Unit, Department of Medicine–Solna, Karolinska Institutet, Stockholm, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MP SJ SC. Analyzed the data: MP SJ. Wrote the first draft of the manuscript: MP. Contributed to the writing of the manuscript: MP SJ SC. Agree with the manuscript’s results and conclusions: MP SJ SC. Data acquisition: SC. Guarantor of this study: MP SJ SC. All authors have read, and confirm that they meet, ICMJE criteria for authorship.