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Cotter JT, Nielsen KC, Guller U, Steele SM, Klein SM, Greengrass RA, Pietrobon R. Increased body mass index and ASA physical status IV are risk factors for block failure in ambulatory surgery - an analysis of 9,342 blocks. Can J Anesth 2004; 51: 810–6.
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Nielsen, K.C., Guller, U., Steele, S.M. et al. A lesson learned. Can J Anesth 52, 770–771 (2005). https://doi.org/10.1007/BF03016568
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DOI: https://doi.org/10.1007/BF03016568