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Article History
Received: 14 January 2019
Accepted: 7 May 2019
First Online: 23 May 2019
Compliance with ethical standards
:
: The authors have declared that no conflict of interest exists.
: This study was approved by the Danish Board of Health and the Danish Data Protection Agency (approval no.: 1-16-02-46-18). National clinical registry studies do not require local ethical committee approval in Denmark.
