Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Jul 1996, 21 (4) 361-370; DOI: 10.1136/rapm-00115550-199621040-00017
Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Jan 1983, 8 (1) 1-5; DOI: 10.1136/rapm-00115550-198308010-00001