Ultrasonographic Guidance Reduces the Amount of Local Anesthetic for 3-in-1 Blocks
Peter Marhofer, Klaus Schrögendorfer, Thomas Wallner, Herbert Koinig, Nikolaus Mayer, Stefan Kapral
Regional Anesthesia & Pain Medicine Nov 1998, 23 (6) 584-588; DOI: 10.1136/rapm-00115550-199823060-00013