Nordström, Peter http://orcid.org/0000-0003-2924-508X
Bergman, Jonathan http://orcid.org/0000-0003-1904-6140
Ballin, Marcel http://orcid.org/0000-0002-9638-7208
Nordström, Anna http://orcid.org/0000-0003-3534-456X
Funding for this research was provided by:
Umea University
Article History
Received: 30 November 2021
Accepted: 25 January 2022
First Online: 15 February 2022
Declarations
:
: Peter Nordström, Jonathan Bergman, Marcel Ballin, and Anna Nordström declare that they have no conflict of interest.
: This study was approved by the Swedish Ethical Review Authority (number 2019-04765), by the National Board of Health and Welfare, and by Statistics Sweden. The study was performed in accordance with the ethical standards as laid down in the Declaration of Helsinki.
: The Swedish Ethical Review Authority waived the requirement of obtaining informed consent given the retrospective study design.