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Authors
Bell, Cathrine http://orcid.org/0000-0003-2313-7889
Fredberg, Ulrich http://orcid.org/0000-0002-7181-1113
Schlünsen, Anders Damgaard Moeller http://orcid.org/0000-0001-7678-5770
Vedsted, Peter http://orcid.org/0000-0003-2113-5599
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Article History
Received: 20 September 2018
Accepted: 20 May 2019
First Online: 31 May 2019
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the Danish Data Protection Agency (record number: 618986). Because the study was based solely on data from administrative and medical databases, no other ethical clearance was required.
: Not applicable.
: The authors declare that they have no competing interests.
