Received: 26 November 2020
Accepted: 26 January 2021
First Online: 3 February 2021
Ethics approval and consent to participate
: The medical ethics committee of Maastricht University stated that the Medical Research Involving Human Subjects Act (WMO) does not apply for this study and that an official approval of this study by the committee was not required (METC2020-1978). The medical ethics committee of Hasselt University formally judged and also approved the study (MEC2020/041). All subjects gave digital informed consent at the start of the survey.
: Not applicable.
: FMEF reports grants and personal fees from AstraZeneca, personal fees from Boehringer Ingelheim, personal fees from Chiesi, personal fees from GlaxoSmithKline, grants and personal fees from Novartis, and personal fees from TEVA, outside the submitted work. DJAJ has received speaker fees from AstraZeneca, Boehringer Ingelheim and Novartis, outside the submitted work. FAK has received research grants from Bayer, Bristol-Myers Squibb, Boehringer-Ingelheim, MSD, Daiichi-Sankyo, Actelion, the Dutch thrombosis association, the Netherlands Organisation for Health Research and Development and the Dutch Heart foundation, all outside this work. MAS reports grants from Netherlands Lung Foundation, grants and personal fees from AstraZeneca, grants and personal fees from Boehringer Ingelheim, and grants from Stichting Astma Bestrijding, all outside the submitted work. All other authors declare that they have no conflicts of interest.