Cluster randomised controlled trial of an online intervention to improve healthy food purchases from primary school canteens: a study protocol of the ‘click & crunch’ trial by Karen Campbell, Rachel Sutherland, Luke Wolfenden, Nicole Nathan, Sze Lin Yoong, Chris Rissel, Penny Reeves, Rebecca Wyse, Tessa Delaney, Pennie Gibbins, Kylie Ball, Kirsty Seward, Rachel Zoetemeyer, John Wiggers, Chris Oldmeadow, Kathryn Reilly

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