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Contributors RTK has full access to all the data in the study and takes responsibility for the integrity and the accuracy of the data analysis. Study concept and design: RTK. Acquisition, analysis or interpretation of the data: All authors. Statistical analysis: MW, EW and RTK. Drafting of the letter: RTK. Critical revision of the manuscript for important intellectual content: All authors.
Competing interests None declared.
Patient consent Obtained.
Ethics approval Regional Ethical Review Board Stockholm (www.epn.se).
Provenance and peer review Not commissioned; externally peer reviewed.
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