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Funding RL was partly supported by grants from the Astrid and David Hagelén Foundation and from the Swedish Research Council (SIMSAM).
Competing interests None.
Ethics approval The Swedish National Board of Health and Welfare is a government agency and may, in accordance with Swedish law, use population-based registers to follow and analyse health and social conditions among the general population. Data were made available to us in such a way that individuals could not be identified.
Provenance and peer review Not commissioned; externally peer reviewed.
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