Received: 25 October 2018
Accepted: 5 March 2019
First Online: 18 March 2019
Ethics approval and consent to participate
: As a registry study, informed consent was not obtained from the persons included. This procedure and the research project were approved by the regional Ethics Committee in Gothenburg, Sweden (registration number 212–14).
: Not applicable.
: The authors declare that they have no competing interests.
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