title: Ultrasound guidance: posterior approach to brachial plexus nerve roots, trunks.
authors.forename: Donald S
authors.initials: DS
authors.lastname: Bohannon
mesh_terms: D001917:Brachial Plexus / Q000000981:diagnostic imaging*; D006801:Humans; D009407:Nerve Block / Q000379:methods*; D013126:Spinal Nerve Roots / Q000000981:diagnostic imaging; D016896:Treatment Outcome; D018084:Ultrasonography, Interventional