Funding for this research was provided by:
Text and Data Mining valid from 2019-12-01
Received: 30 March 2019
Accepted: 11 December 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: Written informed consent was obtained from each participant and the study was approved by the Regional committees of medical research ethics in Uppsala: Reference mummers: 1998/495.
: Not applicable.
: CJ has received payments for educational activities from AstraZeneca, Boehringer Ingelheim, Chiesi, Novartis and Teva, and has served on advisory boards arranged by AstraZeneca, Boehringer Ingelheim, Chiesi, GlaxoSmithKline, Novartis and Teva. EL has received payments for educational activities from AstraZeneca. None of the other authors have any competing interests to declare.