- Correspondence to Professor Stuart Biddle, Physical Activity and Public Health, School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK;
- Accepted 26 June 2011
- Published in print 1 September 2011.
- Published online 11 August 2011.
- Published first 1 August 2011.
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