Document is current

Article History

Received: 23 July 2018

Accepted: 29 August 2018

First Online: 5 September 2018

Ethics approval and consent to participate

: No ethical approval was required according to Danish legislation. However, all study phases have been carried out under strict consideration to the Danish Code of Conduct for Research Integrity [ ] and the Declaration of Helsinki [ ].

: Not applicable.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.