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Ghazaly, H.; Eldemrdash, A.; Atito, B.; Abdelrheem, S.; A. Aly, A. Fentanyl Versus Tramadol As an Adjunct to Bupivacaine in Ultrasound-Guided Supraclavicular Brachial Plexus Blockade: Pros and Cons. apic 2021, 25, 450-457.