Olsen, Rose Mari http://orcid.org/0000-0002-7009-8803
Sletvold, Hege
Article History
Received: 19 June 2018
Accepted: 19 August 2018
First Online: 3 September 2018
Ethics approval and consent to participate
: The research project was approved by The Committee for Medical and Health Research Ethics of Norway (no. 2009/815) and carried out in accordance with the Declaration of Helsinki. Informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.
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