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APA Citation
Wall‐Wieler, E., Abrams, B., Snowden, J. M., & Carmichael, S. L. (n.d.). defining maternal obesity in studies of birth outcomes: Comparing ICD‐9 codes at delivery and measures on the birth certificate. Paediatric and perinatal epidemiology, 34(5), 618–627. http://access.bl.uk/ark:/81055/vdc_100106958433.0x00003d