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Article History

Received: 19 June 2018

Accepted: 26 April 2019

First Online: 6 June 2019

Ethics approval and consent to participate

: The participants of the Pioneer study were informed (in writing and verbally) and tacitly consented to that all data collected in the study, including the data analyzed in this article, may be used in anonymized form for scientific publications. According to Danish law, research studies that use solely questionnaire and register data do not need approval from the National Committee on Health Research Ethics (Den Nationale Videnskabetiske Komité).

: Not applicable.

: All authors declare that they have no competing interests.

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