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    Clements, W., Sneddon, D., Kavnoudias, H., Joseph, T., Goh, G. S., Koukounaras, J., & Snow, T. (n.d.). randomized and controlled study comparing patient controlled and radiologist controlled intra‐procedural conscious sedation, using midazolam and fentanyl, for patients undergoing insertion of a central venous line. Journal of medical imaging and radiation oncology, 62(6), 781–788. http://access.bl.uk/ark:/81055/vdc_100073687045.0x000014