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Article History

Received: 28 May 2019

Accepted: 14 February 2020

First Online: 19 February 2020

Ethics approval and consent to participate

: This study was approved by the Regional Ethical Review Board in Lund (Dnr 2015/712). Due to the requirement of anonymised data, each individual could not be asked for consent to participate; active refusal of participation was instead applied. This was done by publishing information about the planned study in the Swedish local newspapers “Sydöstran” and “Blekinge Läns Tidning”. The advertisement presented the study and contained information on how to contact the data extractor in Blekinge county council by phone, email or mail in order to opt out of the study. The data extractor was then responsible for those that opted out, and they were excluded before any data was delivered to the research manager, Kristine Thorell. This opt out method was approved by the Regional Ethical Review Board in Lund (Dnr 2015/712).

: Not applicable.

: The authors declare that they have no competing interests.