Grøtta, Ole http://orcid.org/0000-0002-2053-7281
Enden, Tone
Sandbæk, Gunnar
Gjerdalen, Gard Filip
Slagsvold, Carl-Erik
Bay, Dag
Kløw, Nils-Einar
Rosales, Antonio
Article History
Received: 8 August 2018
Accepted: 31 October 2018
First Online: 16 November 2018
Authors’ information
: Not applicable.
: The study was approved by the local Data Protection Official for Research at Oslo University Hospital, and by the Regional Committee for Medical and Health Research Ethics. According to this approval consent to participate was not required in this retrospective study.
: The images submitted are entirely unidentifiable. According to the approval by the local Data Protection Official at Oslo University Hospital consent for publication was not required.
: The authors declare that they have no competing interests.
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