Received: 15 February 2021
Accepted: 21 May 2021
First Online: 24 June 2021
: The study was performed in accordance with the Declaration of Helsinki. The Regional Committee for Medical and Health Research Ethics, REC West Norway, approved the study and waived the requirement for informed consent (project number 2018/1541). The Norwegian Institute of Public Health approved the use of prescription data for this study (project number DB2630 and 19/10407).
: Not applicable.
: The authors declare that they have no competing interests.