Funding for this research was provided by:
CONCARD project (grant no. 912184)
Received: 30 October 2018
Accepted: 11 March 2019
First Online: 18 March 2019
Ethics approval and consent to participate
: Patients gave written informed consent. Confidentiality and the right to withdraw from the study were assured. The study was approved by the Norwegian Regional Committee for Ethics in Medical Research (REK 2015/57).
: Not applicable.
: The authors declare that there is no conflict of interest.
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