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Article History

Received: 8 July 2019

Accepted: 9 October 2019

First Online: 9 November 2019

Ethics approval and consent to participate

: According to Danish regulations, the present study does not require approval by the scientific ethical committee system; see §14, part 2 in the Danish law on the ethical handling of scientific health research (). Mothers and children were included in the CPC as it was standard when admitted at the Copenhagen University Hospital in the given time period from 1959 to 61. A substantial amount of the data used in this study was obtained from regular hospital routines. At the time of data collection almost 60 years ago, no rules of formal consent were applicable. However, the mothers were all given explanations of the investigation, guaranteed confidentiality, and were given the opportunity not to participate to any interview []. Additionally, it was voluntary to participate in the follow-ups and a large proportion of the mothers’ chose not to do so, whereby they are not included in the present study.

: Not applicable.

: The authors declare that they have no competing interests.