Effectiveness and cost-effectiveness of a physical activity loyalty scheme for behaviour change maintenance: a cluster randomised controlled trial.
Hunter RF, Brennan SF, Tang J, Smith OJ, Murray J, Tully MA, Patterson C, Longo A, Hutchinson G, Prior L, French DP, Adams J, McIntosh E, and Kee F
BMC Public Health. Jun 2016
(DOI : 10.1186/s12889-016-3244-1)