Funding for this research was provided by:
The Health Research Foundation of North Denmark Region (.)
The Maria Pedersen and Jensine Heiberg Foundation (.)
Text and Data Mining valid from 2020-04-28
Received: 3 May 2019
Accepted: 10 March 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: According to Danish legislation (Law on ethical conduct in health science, Lovtidende:§14, section 2) application for ethical approval is not required for questionnaire-based and register-based studies [CitationRef removed]. The written provision of information about the survey communicated to participants, including information on data retrieval along with the voluntary completion by participants, constituted an implied consent. The data collection was approved by the Danish Data Protection Agency (j.no: 2008-58-0028) and was conducted in accordance with the Helsinki Declaration.
: Not applicable
: MTS reports grants from the Helsefonden, the Health Research Foundation of the North Denmark Region, and the Maria Pedersen and Jensine Heiberg Foundation, during the conduct of the study. CTP reports grants and speaker honorarium from Bayer. HB is a member of the editorial board in the BMC Public Health journal. The other authors report no disclosures.