title: Reply to Dr Johnston.
authors.affiliation: Department of Anesthesia St. Paul's Hospital Department of Anesthesiology, Pharmacology & Therapeutics The University of British Columbia Vancouver, British Columbia, Canada Department of Anesthesia Nanaimo Regional General Hospital Nanaimo, British Columbia, Canada Division of Regional Anesthesia St. Paul's Hospital Department of Anesthesiology, Pharmacology & Therapeutics The University of British Columbia Vancouver, British Columbia, Canada.
authors.forename: Steven D
authors.initials: SD
authors.lastname: Petrar
authors.forename: Michael E
authors.initials: ME
authors.lastname: Seltenrich
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Head
authors.forename: Stephan K W
authors.initials: SK
authors.lastname: Schwarz
mesh_terms: D065527:Brachial Plexus Block / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D018084:Ultrasonography, Interventional / Q000379:methods*