title: Comparing safety in surface landmarks versus ultrasound-guided peripheral nerve blocks: an observational study of a practice in transition.
authors.forename: John J
authors.initials: JJ
authors.lastname: Laur
authors.forename: Guy L
authors.initials: GL
authors.lastname: Weinberg
mesh_terms: D004558:Electric Stimulation; D006801:Humans; D009407:Nerve Block / Q000009:adverse effects*; D018084:Ultrasonography, Interventional