Bratland-Sanda, S. http://orcid.org/0000-0002-4202-5439
Vrabel, K. A.
Article History
Received: 30 December 2017
Accepted: 1 June 2018
First Online: 1 July 2018
Ethics approval and consent to participate
: This study was approved by Regional Committee for Medical and Health Research Ethics in Southern Norway (approval no. 2012/1186b). All participants gave their written consent to participation.
: The authors declare that they have no competing interests.
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