Barber, S., Jackson, C., Hewitt, C., Ainsworth, H., Buckley, H., Akhtar, S., …Wright, J. (2016). Assessing the feasibility of evaluating and delivering a physical activity intervention for pre-school children: a pilot randomised controlled trial. Pilot and Feasibility Studies, 2(1), Article 12. https://doi.org/10.1186/s40814-016-0052-4