1. World Health Organization, Obesity and overweight Fact sheet 311; 04 November 2017. Available from: http://www.who.int/mediacentre/factsheets/fs311/en/.
2. World Health Organization, Noncommunicable diseases Fact sheet 355; 2017. Available from: http://www.who.int/mediacentre/factsheets/fs355/en/.
3. World Health Organization, Physical activity Fact sheet 385; 2017. Available from: http://www.who.int/mediacentre/factsheets/fs385/en/.
4. Contextual factors related to physical activity during daily middle school physical education;TA Brusseau;Journal of Science and Medicine in Sport,2016
5. Effect of a Comprehensive School Physical Activity Program on School Day Step Counts in Children;RD Burns;Journal of Physical Activity and Health,2015