Received: 21 January 2019
Accepted: 11 June 2019
First Online: 22 June 2019
Ethics approval and consent to participate
: We obtained prior approval from both the Regional Ethics Committee (case 2014/723/REK sør-øst) and the Hospital Safety Representative (case 14/072) in order to conduct a retrospective study in medical records without requiring prior consent from the patients we investigated.
: Not applicable.
: The authors declare that they have no competing interests.