Funding for this research was provided by:
Economic and Social Research Council (ES/K000357/1)
Medical Research Council (092731)
Wellcome Trust (092731)
Text and Data Mining valid from 2019-02-26
Received: 21 May 2018
Accepted: 22 January 2019
First Online: 26 February 2019
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the ALSPAC Ethics and Law Committee and the Local Research Ethics Committees. Health Research Authority ethics approval for this linkage was given by the North West (Haydock) Committee, reference number: 10/H1010/70. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare they have no competing interests.
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