Received: 10 October 2019
Accepted: 22 July 2020
First Online: 5 August 2020
Ethics approval and consent to participate
: The aim of the project falls outside the Health Research Act and the study was deemed not to need approval by the Regional Committees for Medical and Health Research Ethics. The study was approved by the Data Protection Officer at the University Hospital of North Norway and the Data Protection Officer at Apotek 1 Gruppen AS. Because it was a retrospective study and all data was anonymised by Apotek 1, the need to obtain written informed consent was waived.
: Not applicable.
: Apotek 1 Gruppen AS, a supplier of multidose dispensed drugs in Norway, provided data for this study. A.V. Jøsendal is employed by Apotek 1 Gruppen AS. The other authors declare no conflict of interest relevant to this study.