RT Journal Article SR Electronic T1 Hyperbaric spinal ropivacaine: a comparison to bupivacaine in volunteers. JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 8 OP 8 DO 10.1136/rapm-00115550-199924031-00008 VO 24 IS Suppl 1 A1 Susan B. McDonald A1 Spencer S. Liu A1 Dan J. Kopacz A1 Carol A Stephenson YR 1999 UL http://rapm.bmj.com/content/24/Suppl_1/8.abstract AB