Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control May 1991, 16 (3) 161-163; DOI: 10.1136/rapm-00115550-199116030-00009
Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Jan 1991, 16 (1) 59-61; DOI: 10.1136/rapm-00115550-199116010-00014