Kristensen, Pia Kjær http://orcid.org/0000-0001-5473-9386
Johnsen, Søren Paaske
Thomsen, Reimar Wernich
Funding for this research was provided by:
Health Research Fund of Central Denmark Region
Article History
Received: 15 May 2018
Accepted: 8 April 2019
First Online: 24 April 2019
Ethics approval and consent to participate
: Ethics committee approval, or consent to participate, was not required for this purely registry based study, according to Danish legislation. The study was approved by the Danish Data Protection Agency (journal number 2015-57-0002, Aarhus University journal number 2016–051-000001 with sequential number 608). No further administrative permissions were required to access the data.
: Not applicable.
: The authors declare that they have no competing interests.
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