RT Journal Article SR Electronic T1 Modification of Beta-Endorphin Plasma Levels Following Transcutaneous Nerve Stimulation JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 3 OP 3 DO 10.1136/rapm-00115550-199318011-00003 VO 18 IS Suppl 1 A1 E. Rodriguez Alvarez A1 C. Bonome Gonzales A1 M. Gomez Rois A1 T. Rey Rilo A1 L. Encinar Arias YR 1993 UL http://rapm.bmj.com/content/18/Suppl_1/3.abstract AB