Ghazaly, H., Eldemrdash, A., Atito, B., Abdelrheem, S., & A. Aly, A. (2021). Fentanyl versus tramadol as an adjunct to bupivacaine in ultrasound-guided supraclavicular brachial plexus blockade: pros and cons. Anaesthesia, Pain & Intensive Care, 25(4), 450-457. https://doi.org/10.35975/apic.v25i4.1565