Received: 28 March 2019
Accepted: 10 July 2019
First Online: 17 July 2019
Ethics approval and consent to participate
: According to regulations of the regional ethical committee (REK) the study design did not require informed patient consent. The study was presented to and approved by the Internal Privacy Ombudsmann of Akershus University Hospital., who gave permission to access the raw data, with approval number 15–129.
: Not applicable as details related to study objects were not recorded for this study.
: The authors declare that they have no competing interests.