Funding for this research was provided by:
Received: 10 May 2020
Accepted: 6 April 2021
First Online: 17 April 2021
: The study was conducted in accordance with the Declaration of Helsinki. This study was approved by the Ethical Committee of the Uppsala Region, Sweden (Dnr 2018/239). Each participant voluntarily provided a written informed consent before participating. The participants or workplaces received no compensation for participation in the study.
: Not applicable.
: The authors declare that they have no competing interests.