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Article History

Received: 6 April 2017

Accepted: 16 May 2019

First Online: 6 June 2019

Compliance with ethical standards

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: The authors hereby certify that, to the best of their knowledge, no financial support or benefits have been received by any coauthor, by any member of their immediate families, or by any individual or entity with whom or with which they have a significant relationship from any commercial source that is related directly or indirectly to the scientific work reported in this article.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: All data used in the present study were obtained in a clinical context as part of a standardized treatment regime with acceptance from the parents, and the study is in agreement with the World Medical Association Declaration of Helsinki. The study is, as defined by the “Danish Act on Research Ethics Review of Health Research Projects,” a registered research project that does not require special ethical approval from The Committees on Health Research Ethics for the Capital Region of Denmark.