RT Journal Article SR Electronic T1 Caudal block with ropivacaine 0,2% or levobupivacaine 0,2% in children (1-10 years), for infra-umbilical surgery: 81. JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 29 OP 29 DO 10.1016/rapm-00115550-200609002-00055 VO 31 IS Suppl 2 A1 F. Barros A1 S. Vargas YR 2006 UL http://rapm.bmj.com/content/31/Suppl_2/29.2.abstract AB