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APA Citation
Whincup, P. H., Gilg, J. A., Odoki, K., Taylor, S. J. C., & Cook, D. G. (2001). age of menarche in contemporary British teenagers: survey of girls born between 1982 and 1986. BMJ, 322(7294), 1095–1096. http://access.bl.uk/ark:/81055/vdc_100141636931.0x00003d