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Article History

Received: 4 August 2017

Accepted: 22 January 2018

First Online: 2 February 2018

Ethics approval and consent to participate

: The project was approved by the Danish Data Protection Agency (REG-132-2015), and by the Danish Patient Safety Authority (3–3013-1440/1). Due to the anonymized, non-invasive, retrospective nature of the study, the requirement for specific scientific ethical committee was waived by the Danish Patient Safety Authority.

: Due to the anonymized, non-invasive, retrospective nature of the study, the Danish Patient Safety Authority (3–3013-1440/1) has waved the requirement for individual patient approval.

: The authors have no conflict of interest. The results presented in this paper have not been published previously in whole or part, except in abstract format.

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