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APA Citation
Palacio, M., Cobo, T., Antolín, E., Ramirez, M., Cabrera, F., Mozo de Rosales, F., Bartha, J., Juan, M., Martí, A., Oros, D., Rodríguez, À., Scazzocchio, E., Olivares, J., Varea, S., Ríos, J., Gratacós, E., & , (n.d.). vaginal progesterone as maintenance treatment after an episode of preterm labour (PROMISE) study: a multicentre, double‐blind, randomised, placebo‐controlled trial. BJOG, 123, 1990–1999. http://access.bl.uk/ark:/81055/vdc_100038681955.0x000007