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APA Citation
Amorim-Costa, C., Cruz, J., Ayres-de-Campos, D., & Bernardes, J. (n.d.). gender-specific reference charts for cardiotocographic parameters throughout normal pregnancy: a retrospective cross-sectional study of 9701 fetuses. European journal of obstetrics, gynecology, and reproductive biology, 199, 102–107. http://access.bl.uk/ark:/81055/vdc_100031196874.0x000030