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Bull, Fiona C; Milton, Karen; Kahlmeier, Sonja (2014). National policy on physical activity: the development of a policy audit tool (PAT). Journal of Physical Activity and Health, 11(2):233-240.
Hallal, Pedro C; Andersen, Lars Bo; Bull, Fiona C; Guthold, Regina; Haskell, William; Ekelund, Ulf; Kahlmeier, Sonja (2012). Global physical activity levels: surveillance progress, pitfalls, and prospects. Lancet, 380(9838):247-257.