title: Complex arithmetic at the brachial plexus roots.
authors.forename: Patrick
authors.initials: P
authors.lastname: Filip
mesh_terms: D000776:Anesthesiology / Q000193:education; D001917:Brachial Plexus / Q000000981:diagnostic imaging*; D002983:Clinical Competence; D006801:Humans; D009407:Nerve Block / Q000379:methods*; D018084:Ultrasonography, Interventional