Funding for this research was provided by:
Wellcome Trust (103046/Z/13/Z)
Medical Research Council Canada (G0701484)
Text and Data Mining valid from 2019-07-18
Received: 15 November 2018
Accepted: 8 July 2019
First Online: 18 July 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the NHS National Research Ethics Service (NHS RES London REC 08/H0718/76; 14/LO/0170). Parents provided written informed consent. At the mid-childhood visit, children provided written informed assent wherever possible given developmental level.
: Not applicable
: The authors declare that they have no competing interests.