title: Learning the 'traceback' approach for interscalene block.
authors: University of Alberta, Edmonton, Canada. btsui@ualberta.ca.
authors: B C
authors: BC
authors: Tsui
authors: L
authors: L
authors: Lou
mesh_terms: D000776:Anesthesiology / Q000193:education; D001917:Brachial Plexus / Q000000981:diagnostic imaging*; D004503:Education, Medical, Graduate / Q000379:methods; D006801:Humans; D009407:Nerve Block / Q000379:methods*; D018084:Ultrasonography, Interventional / Q000379:methods