Wilk, P. ., Clark, A. ., Maltby, A. ., Smith, C. ., Tucker, P. ., & Gilliland, J. . (2018). Examining individual, interpersonal, and environmental influences on children’s physical activity levels. SSM - Population Health, 4, 76-85. https://doi.org/10.1016/j.ssmph.2017.11.004