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APA Citation
Simpson, R., Hesketh, K., Crozier, S., Baird, J., Cooper, C., Godfrey, K., Harvey, N., Westgate, K., Inskip, H., & van Sluijs, E. (n.d.). cross-sectional associations between number and ages of children and maternal physical activity. European journal of public health, 31, . http://access.bl.uk/ark:/81055/vdc_100144497712.0x000023