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APA Citation
Dall'Asta, A., Volpe, N., Schera, G., Kiener, A., Galli, L., Commare, A., Angeli, L., di Pasquo, E., & Ghi, T. (n.d.). oP13.11: Transabdominal and transperineal intrapartum ultrasound and mode of delivery in prolonged second stage of labour. Ultrasound in obstetrics & gynecology, 52, 104. http://access.bl.uk/ark:/81055/vdc_100090052428.0x000037