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Article History

Received: 23 April 2020

Accepted: 10 December 2020

First Online: 16 December 2020

Ethics approval and consent to participate

: Based on the study set-up, there was no need for any ethical application. This is based on Swedish law, SFS 2003:460 [], which states that ethical approval by the Swedish Ethical Review Authority is required only for projects involving physical interventions, biological sampling, or projects that might affect participants in any possible physical or psychological way, or if the project treats sensitive personal data or personal data about law violations. After consulting the Swedish Ethical Review Authority, no such material was identified as handled in this project since there was no risk for the participants to suffer any physical or mental harm, nor any sensitive or personal information to be collected. All participating individuals volunteered by contacting the principal investigator themselves showing interest for participation. All participants gave their consent prior to inclusion.

: Not applicable.

: The authors have collected and analyzed the material alone and declare that they have no competing interests.