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APA Citation
Hunter, R. F., Murray, J. M., Gough, A., Tang, J., Patterson, C., French, D. P., McIntosh, E., Xin, Y., Kee, F., & , (n.d.). effectiveness and cost-effectiveness of a loyalty scheme for physical activity behaviour change maintenance: a cluster randomised controlled trial. Lancet, 392, S4–. http://access.bl.uk/ark:/81055/vdc_100073405279.0x000055