Funding for this research was provided by:
Municipality of Herning (15.20.00-G01-33-12)
Central Denmark Region Health Science Research Fund (A955)
Text and Data Mining valid from 2019-11-07
Received: 20 May 2019
Accepted: 26 September 2019
First Online: 7 November 2019
Ethics approval and consent to participate
: The study was appoved by the Danish Data Protection Agency. According to Danish Law (Act on Research Ethics Review of Health Research Projects), questionnaire and register-based studies require neither approval by ethical or scientific committees nor informed consent [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.