Funding for this research was provided by:
British Heart Foundation (PG/11/51/28986, SP 14/4/31123)
Medical Research Council (MC_UU_1201/5)
UK National Institute of Health and Research (NF-SI-0166-10196)
Text and Data Mining valid from 2018-04-07
Received: 21 November 2017
Accepted: 27 March 2018
First Online: 7 April 2018
Ethics approval and consent to participate
: Ethical approval for this study was provided by the School for Policy Studies Research Ethics Committee at the University of Bristol and written parental consent was provided for both parent and child participation.
: Not applicable.
: The authors declare that they have no competing interests.
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