Funding for this research was provided by:
Received: 2 September 2020
Accepted: 16 March 2021
First Online: 6 April 2021
: Not applicable given that no individual data was used in this study.
: Not applicable.
: While none of the authors had a conflict of interest related to the study, they were dependent on the supermarket chain for receiving the data. The supermarket chain had no influence on the analysis plan, the results and the decision on whether or not the study results would be published.