Caudal epidural butorphanol plus bupivacaine versus bupivicaine in pediatric outpatient genitourinary procedures
Lawhorn CD, Brown RE, Schmitz ML, Huggins DP, Kymer PJ, Shirey R, Volpe P. Caudal epidural butorphanol plus bupivacaine versus bupivicaine in pediatric outpatient genitourinary procedures.