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Article History

Received: 8 January 2021

Accepted: 31 October 2021

First Online: 15 November 2021

Declarations

:

: David Mataix-Cols receives royalties for contributing articles to UpToDate, Wolters Kluwer Health and Elsevier, outside the current work. Lorena Fernández de la Cruz receives royalties for contributing articles to UpToDate, Wolters Kluwer Health, outside the current work. Henrik Larsson has served as a speaker for Evolan and Shire and has received research grants from Shire, outside the current work. The other authors report no conflicts of interest.

: All procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008. The study was approved by the Stockholm Regional Ethical Review Board. The requirement for informed consent was waived because the study was register-based and the data de-identified (i.e., we had no access to the personal identification of the included individuals).

: Not applicable.

: Not applicable.

: The data that support the findings of this study are not publicly available because of the Swedish Secrecy Act. Researchers may apply for access through the Swedish Research Ethics Boards () and from the primary data owners: Statistics Sweden () and the National Board of Health and Welfare (), in accordance with Swedish law.

: Stata code used in this study can be made available to researchers upon request to the correspondent author.