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Puolakka R, Haasio J, Rosenberg PH, Tuominen M. Comparison of Double-Hole and Single-Hole Pencil-Point Needles for Spinal Anesthesia With Hyperbaric Bupivacaine. Regional Anesthesia and Pain Medicine. 1998 May;23(3):271–7. doi: 10.1097/00115550-199823030-00008. |