RT Journal Article SR Electronic T1 Bevel Direction, Dura Geometry and Hole Size in Membrane Puncture JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 80 OP 80 DO 10.1136/rapm-00115550-199621021-00080 VO 21 IS Suppl 2 A1 Mocek, C. A1 Kempen, P M YR 1996 UL http://rapm.bmj.com/content/21/Suppl_2/80.abstract AB