Poulsen, Per Hoegh https://orcid.org/0000-0002-0196-2290
Biering, Karin
Winding, Trine Nøhr
Nohr, Ellen Aagaard
Andersen, Johan Hviid
Funding for this research was provided by:
Municipality of Herning (15.20.00-G01-33-12)
Central Denmark Region Health Science Research Fund (A955)
Article History
Received: 26 April 2018
Accepted: 23 August 2018
First Online: 3 December 2018
Ethics approval and consent to participate
: The study was carried out according to the Declaration of Helsinki. According to Danish law, approval by the Ethics Committee and written informed consent was not required in questionnaire-based and register-based projects. Additional information is available at The National Committee on Health Research Ethics’ webpage in the “Act on Research Ethics Review of Health Research Projects” § 14,2. Available from . Use of the data was carried out under the same conditions and with the same purpose as when originally collected and based on approval from the Danish Data Protection Agency and their rules of data protection.
: Not applicable.
: The authors declare that they have no competing interests.
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