RT Journal Article SR Electronic T1 Paravertebral somatic nerve block for outpatient inguinal herniorraphy JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 54 OP 54 DO 10.1136/rapm-00115550-199823031-00054 VO 23 IS Suppl 1 A1 Stephen M. Klein A1 R. A. Greengrass A1 D. S. Warner YR 1998 UL http://rapm.bmj.com/content/23/Suppl_1/54.abstract AB