Deen, Laura
,
Cowan, Susan
Wejse, Christian http://orcid.org/0000-0002-2534-2942
Petersen, Jørgen Holm
Norredam, Marie
Article History
Received: 10 February 2018
Accepted: 19 June 2018
First Online: 3 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The project was approved by the Danish Protection Agency (No 2012-41-0065). Further ethical approval regarding registry-based research is not required in Denmark. The data set was made available and analysed in an anonymous form by remote online access to the data set stored at Statistics Denmark.