Comparative Study of Ropivacaine 0.5% With Fentanyl and Bupivacaine 0.5% With Fentanyl in Interscalene Brachial Plexus Block. Int J of Biomed & Adv Res 2016, 7 (11), 543-546. https://doi.org/10.7439/ijbar.v7i11.3747.