Funding for this research was provided by:
The Danish Working Environment Research Fund (24-2011-03)
Text and Data Mining valid from 2019-08-26
Received: 17 February 2019
Accepted: 14 August 2019
First Online: 26 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was notified to the Scientific Ethical Committee, The Capital Region of Denmark (journal no.: H-4-2011-125), but according to Danish law, register-based studies and questionnaire studies need neither approval from ethical and scientific committees nor informed consent (The National Committee on Health Research Ethics (DNVK) Copenhagen 2011). The study was registered at The Danish Data Protection Agency (The Danish Data Protection Agency 2008). All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the survey study.