Changes in household food and drink purchases following restrictions on the advertisement of high fat, salt, and sugar products across the Transport for London network: A controlled interrupted time series analysis, Yau, Amy, Berger Nicolas, Law Cherry, Cornelsen Laura, Greener Robert, Adams Jean, Boyland Emma J., Burgoine Thomas, de Vocht Frank, Egan Matt, et al. , PLOS Medicine, May-02-2023, Volume 19, Issue 2, (2022)