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APA Citation
Fell, D., Savitz, D., Kramer, M., Gessner, B., Katz, M., Knight, M., Luteijn, J., Marshall, H., Bhat, N., Gravett, M., Skidmore, B., & Ortiz, J. (n.d.). maternal influenza and birth outcomes: systematic review of comparative studies. BJOG, 124, 48–59. http://access.bl.uk/ark:/81055/vdc_100039977789.0x000016