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Article History

Received: 27 March 2018

Accepted: 15 November 2018

First Online: 29 November 2018

Ethics approval and consent to participate

: The project was registered and treated by the data protection officer (personvernombudet) at Oslo University Hospital and the Norwegian Social Science Data Services (NSD), and granted permission before the data collection started. The project was submitted to the Regional Committees for Medical and Health Research Ethics (REC) South East, but was considered to be outside the remit of the Act on Medical and Health Research and could therefore be implemented without the approval of the REC. The participants were informed about the purpose of the study and that they could withdraw their participation without giving any reason. They all gave written consent to participate in the study. The consent form was approved by the data protection officer at Oslo University Hospital and by the NSD.

: Not applicable.

: The authors declare that they have no competing interests.

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