Evaluating the effectiveness of the smartphone app, Drink Less, compared with the NHS alcohol advice webpage, for the reduction of alcohol consumption among hazardous and harmful adult drinkers in the UK at 6‐month follow‐up: protocol for a randomised controlled trial - Garnett, Claire; Oldham, Melissa; Angus, Colin; Beard, Emma; Burton, Robyn; Field, Matt; Greaves, Felix; Hickman, Matthew; Kaner, Eileen; Loebenberg, Gemma; Michie, Susan; Munafò, Marcus; et al. (Addiction, 2021)