Funding for this research was provided by:
Received: 10 June 2020
Accepted: 18 November 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: The study was approved by the Regional Committees for Medical and Health Research Ethics (REK-Nord, case # 2011/1307) and was conducted in accordance with the Declaration of Helsinki. All study subjects signed informed consent forms.
: Not applicable.
: CD, HGW: The authors declare that they have no competing interests. TME: Reports bursary from Boehringer Ingelheim for educational meetings within the last three years, unrelated to the current study. RN: Reports grants from GlaxoSmithKline, during the conduct of the study; grants from Boehringer Ingelheim, grants and personal fees from AstraZeneca, grants from Novartis, grants from Boehringer Ingelheim, personal fees from GlaxoSmithKline, outside the submitted work.