Funding for this research was provided by:
Economic and Social Research Council (ES/J019119/1, RES-586-47-0001, RES-518-28-001, RES-586-47-0002)
Text and Data Mining valid from 2018-03-20
Received: 24 October 2016
Accepted: 26 February 2018
First Online: 20 March 2018
Ethics approval and consent to participate
: Ethical approval was obtained from the university ethics committee and the National Research Ethics Service. Adults 16 and older provided written consent to participate. For adolescents aged 10-15, parental or responsible adult verbal consent was required and obtained for participation.
: Not applicable.
: The authors declare no competing interests.
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