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APA Citation
Napolitano, R., Dhami, J., Ohuma, E., Ioannou, C., Conde‐Agudelo, A., Kennedy, S., Villar, J., & Papageorghiou, A. (n.d.). pregnancy dating by fetal crown–rump length: a systematic review of charts. BJOG, 121, 556–565. http://access.bl.uk/ark:/81055/vdc_100024779414.0x000028