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APA Citation
Castanon, A., Brocklehurst, P., Evans, H., Peebles, D., Singh, N., Walker, P., Patnick, J., & Sasieni, P. (2012). risk of preterm birth after treatment for cervical intraepithelial neoplasia among women attending colposcopy in England: retrospective-prospective cohort study. BMJ, 345, . http://access.bl.uk/ark:/81055/vdc_100148627332.0x00001a