Comparison between Perineural and Intravenous Dexamethasone on Duration of Analgesia in Supraclavicular Brachial Plexus Block - An Observational Study. - Sahana, Siddhartha; Aithal, Rashmi R.; Haroon, Shahbaz; Bhat, Sonal; Vazhayil, Jawabulla; Abdul, Ahlam (Annals of African Medicine, 2026)