Funding for this research was provided by:
Danish Health Foundation (2010 B 131)
Article History
Received: 25 January 2018
Revised: 28 October 2018
Accepted: 22 November 2018
First Online: 11 December 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Written <i>informed consent</i> was obtained from all the participants. In Denmark, researchers are entitled to use registers for research purposes (regarding the control group and non-participants of the intervention group) without persons’ informed consent as long as the researchers comply with predefined research regulations.
: The study was approved by the Regional Scientific Ethics Committee (KA 98 155) and the Danish Data Protection Agency. The study is registered at ClinicalTrials.Gov (NCT00289237).
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.