Clinical trials referenced in this document:
Funding for this research was provided by:
National Institute for Health Research
Wellcome Trust (206853/Z/17/Z, 106679/Z/14/Z)
Received: 2 May 2019
Accepted: 12 July 2019
First Online: 17 July 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the University of Cambridge Research Ethics Committee (Pre.2017.035). Consent was not sought from customers as knowledge of the intervention could have impacted on the outcome. No compensation was offered to the restaurant or bars.
: Not applicable.
: The authors declare that they have no competing interests.