1. Butland B, Jebb S, Kopelman P, McPherson K, Thomas S, Mardell J et al. Foresight. Tackling Obesities: Future Choices—Project Report. Government Office for Science: UK, 2007.
2. Bronfenbrenner U . Making Human Beings Human. Bioecological Perspectives on Human Development. Sage Publications, Thousand Oaks: CA, 2005.
3. Sallis J, Owen N . Ecological models of health behavior. In: Glanz K, Rimer BK, Lewis FM (eds). Health Behavior and Health Education: Theory, Research & Practice. Jossey-Bass: San Francisco, USA, 2002; 462–484.
4. Ferreira I, van der Horst K, Wendel-Vos W, Kremers S, van Lenthe FJ, Brug J . Environmental correlates of physical activity in youth—a review and update. Obes Rev 2007; 8: 129–154.
5. Baranowski T, Thompson WO, DuRant RH, Baranowski J, Puhl J . Observations on physical activity in physical locations: age, gender, ethnicity, and month effects. Res Q Exerc Sport 1993; 64: 127–133.