Funding for this research was provided by:
Medical Research Council (MR/K021656/1)
Wellcome Trust (WT101597MA)
Medical Research Council / ESRC (MR/N024397/1)
Received: 3 January 2017
Accepted: 16 January 2018
First Online: 1 February 2018
Ethics approval and consent to participate
: Ethics approval for the BiB cohort study including the analyses reported here, was provided by Bradford Local Research Ethics Committee (ref 06/Q1202/48). Mothers taking part in the BiB cohort provided written informed consent for themselves and their child prior to taking part in the study. This included consent for both their and their child’s data to be used in future analyses and linkage to routine health information. No individual participant data is reported in this study. Permission to use BiB data was granted by the BiB Executive and the BiB Analysis Co-ordination group.
: Not applicable
: The authors declare that they have no competing interests
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