RT Journal Article SR Electronic T1 The Effect of Needletype, Gauge, and use of an Introducer Needle on the Deflection of Spinal Needles Through Test Media JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 57 OP 57 DO 10.1136/rapm-00115550-199722021-00057 VO 22 IS Suppl 2 A1 J. Flanagan A1 G. Steube YR 1997 UL http://rapm.bmj.com/content/22/Suppl_2/57.abstract AB