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APA Citation
Chinn, D. J., Fordham, J. N., Kibirige, M. S., Crabtree, N. J., Venables, J., Bates, J., & Pitcher, O. (2005). bone density at the os calcis: reference values, reproducibility, and effects of fracture history and physical activity. Archives of disease in childhood, 90(1), 30–35. http://access.bl.uk/ark:/81055/vdc_100130158405.0x000043