Funding for this research was provided by:
Helse Sør-Øst RHF (2015058, 2016056)
Received: 25 September 2017
Accepted: 4 July 2018
First Online: 13 July 2018
Ethics approval and consent to participate
: This study has been performed in accordance with the ExternalRef removed , and approved by the regional ethics committee (Regional committees for medical and health research ethics - South East), Approval no: 2013/169/REK sør-øst D, and Approval no:S-06402b. The patients were given oral and written information prior to inclusion, and signed an informed consent.
: Not applicable.
: No autors have declared competing interests.
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