Funding for this research was provided by:
Wellcome Trust (098330/Z/12/Z)
Text and Data Mining valid from 2020-01-23
Received: 3 December 2018
Accepted: 31 December 2019
First Online: 23 January 2020
Ethics approval and consent to participate
: Ethical approval was obtained for all adults and younger children from the North West Wales Research Ethics Committee (13/WA/0194) and for younger and older children from the Birkbeck College Ethics Committee (121373 and 151632, respectively). Written informed consent was obtained from the parents of all children, from adults where they had capacity to consent, and via an appointed consultee where adults did not have capacity to consent, in accordance with the UK Mental Capacity Act 2005.
: Not applicable
: The authors declare that they have no competing interests.