Funding for this research was provided by:
Norges Forskningsråd (no. 269855)
Helse Vest (Åpen prosjektstøtte)
Received: 26 March 2020
Accepted: 23 June 2020
First Online: 30 June 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethical Committee (no. 2018/939), Norway, on June 19, 2018 and by the Regional Ethical Review Committee in Stockholm (no 2018/2080–31/1), Sweden, on November 14, 2018. No informed consent from the participants was required.
: Not applicable.
: I.O. is employed at the Centre for Pharmacoepidemiology, Karolinska Institutet, which receives grants from several entities (pharmaceutical companies, regulatory authorities, and contract research organizations) for performance of drug safety and drug utilization studies, unrelated to this work. None of the other authors have competing interests.