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APA Citation
Soni, S., Krantz, D. A., Blitz, M. J., Vohra, N., & Rochelson, B. (2019). elevated maternal serum-free β-human chorionic gonadotropin (β-hCG) and reduced risk of spontaneous preterm delivery*. Journal of maternal-fetal & neonatal medicine, 32, 3191–3196. http://access.bl.uk/ark:/81055/vdc_100086828739.0x000013