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)
National Institute for Health Research (NF-SI-0166-10196)
Text and Data Mining valid from 2019-08-22
Received: 30 April 2019
Accepted: 13 August 2019
First Online: 22 August 2019
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.