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APA Citation
Pi, X., Li, Z., Jin, L., Liu, J., Zhang, Y., Zhang, L., Wang, L., & Ren, A. (n.d.). secondhand smoke during the periconceptional period increases the risk for orofacial clefts in offspring. Paediatric and perinatal epidemiology, 32(5), 423–427. http://access.bl.uk/ark:/81055/vdc_100070816899.0x00003a