Protocol for an effectiveness-implementation hybrid trial to assess the effectiveness and cost-effectiveness of an m-health intervention to decrease the consumption of discretionary foods packed in school lunchboxes: the 'SWAP IT' trial

- Sutherland, Rachel; Brown, Alison; Bailey, Andrew; Evans, Nicole; Gillham, Karen; Oldmeadow, Christopher; Searles, Andrew; Reeves, Penny; Rissel, Chris; Davies, Marc; Reilly, Kathryn; Cohen, Brad; Nathan, Nicole; McCallum, Tim; Wolfenden, Luke; Janssen, Lisa; Reynolds, Renee; Walton, Alison; Hudson, Nayerra; Chooi, Amelia; Yoong, Serene; Wiggers, John