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    Hofmeyr, G., Singata, M., Lawrie, T., Vogel, J., Landoulsi, S., Seuc, A., & Gülmezoglu, A. (2015). a multicentre randomized controlled trial of gentle assisted pushing in the upright posture (GAP) or upright posture alone compared with routine practice to reduce prolonged second stage of labour (the Gentle Assisted Pushing study): study protocol. Reproductive health, 12(1), 1–10. http://access.bl.uk/ark:/81055/vdc_100080382430.0x0000ae