Funding for this research was provided by:
Medical Research Council
First Online: 7 June 2019
Compliance with Ethical Standards
: All authors declare no conflict of interest.
: All procedures were in accordance with the ethical standards of the local ethics committee (17-214), guidelines from the British Psychological Society, and with the 1964 Helsinki declaration and its later amendments.
: Informed consent was obtained from all individual participants included in the study.