![Is a change in mode of travel to school associated with a change in overall physical activity levels in children? Longitudinal results from the SPEEDY study]()
Is a change in mode of travel to school associated with a change in overall physical activity levels in children? Longitudinal results from the SPEEDY studyLee Smith, Shannon Sahlqvist, David Ogilvie, Andy Jones, Kirsten Corder, Simon J Griffin, Esther van Sluijs · 2012