A cluster randomised controlled trial of an intervention to increase the implementation of school physical activity policies and guidelines: study protocol for the physically active children in education (PACE) study. - Nathan, Nicole; Wiggers, John; Bauman, Adrian E; Rissel, Chris; Searles, Andrew; Reeves, Penny; Oldmeadow, Christopher; Naylor, Patti-Jean; Cradock, Angie L; Sutherland, Rachel; Gillham, Karen; Duggan, Bernadette; et al. (BMC Public Health, 2019)