Funding for this research was provided by:
Public Health England
Article History
Received: 12 September 2017
Accepted: 17 May 2018
First Online: 29 May 2018
Ethics approval and consent to participate
: NHS Research Ethics Committees ethical approval was sought and granted for BCS70 follow-ups from 2000 onwards. The approach to consent has changed considerably since 1970 and available records suggest that internal university-based ethical review was sought for previous surveys. Informed parental consent was sought pre-2000 but there is no evidence that this was written consent [].
: The authors declare that they have no competing interests.
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