Effectiveness and cost-effectiveness of a loyalty scheme for physical activity behaviour change maintenance: results from a cluster randomised controlled trial.
Ruth F HunterJennifer M MurrayAisling GoughJianjun TangChristopher C PattersonDavid P FrenchEmma McIntoshYiqiao XinFrank Keenull nullPublished in: The international journal of behavioral nutrition and physical activity (2018)
ISRCTN17975376 (Registered 19/09/2014).