Impact of decreasing the proportion of higher energy foods and reducing portion sizes on food purchased in worksite cafeterias: A stepped-wedge randomised controlled trial. by James P Reynolds, Minna Ventsel, Daina Kosīte, Brier Rigby Dames, Laura Brocklebank, Sarah Masterton, Emily Pechey, Mark Pilling, Rachel Pechey, Gareth J Hollands, Theresa M Marteau

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