Received: 1 February 2019
Accepted: 24 April 2019
First Online: 3 May 2019
Ethics approval and consent to participate
: This study first recruited companies. To ensure that participation was informed and voluntary, all participants was approached individually. Written and verbal information about the project was given, and oral informed consent was obtained from all participants. The study was approved by the Regional Committee for Medical and Health Research Ethics.
: Not applicable.
: The authors declare that they have no competing interests.
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