Ruggajo, Paschal
Leh, Sabine
Svarstad, Einar
Marti, Hans-Peter
Vikse, Bjørn Egil
Article History
Received: 12 May 2017
Accepted: 5 October 2018
First Online: 22 October 2018
Ethics approval and consent to participate
: The regional ethics committee of Western Norway gave clearance for the study (2013/553).
: The manuscript does not contain individual participant’s data.
: The authors declare that they have no competing interests.
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