title: A tale of two needle passes.
authors.forename: Francis V
authors.initials: FV
authors.lastname: Salinas
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Neal
mesh_terms: D000765:Anesthesia, Conduction / Q000295:instrumentation / Q000379:methods*; D000776:Anesthesiology / Q000193:education; D000779:Anesthetics, Local / Q000008:administration & dosage / Q000493:pharmacokinetics; D006801:Humans; D009339:Needles; D009407:Nerve Block / Q000295:instrumentation / Q000379:methods*; D016032:Randomized Controlled Trials as Topic / Q000592:standards; D004561:Transcutaneous Electric Nerve Stimulation; D018084:Ultrasonography, Interventional
chemical_list: D000779:Anesthetics, Local