Regional Anesthesia and Pain ControlThe Addition of Fentanyl to Local Anesthetics Affects the Quality and Duration of Cervical Plexus Block A Randomized, Controlled TrialSurvey of Anesthesiology 55(4):p 193-194, August 2011. | DOI: 10.1097/SA.0b013e318222e3d3 Buy Metrics Copyright © 2011 Wolters Kluwer Health, Inc. All rights reserved.