Chowdhury, R. N., Rahman, K. M., Khan, S. U., Sarker, R., Nabi, S., Siddiqui, M. R., & Mohammad, Q. D. (2011). Digital Subtraction Angiogram (DSA) is Superior to Duplex Ultrasound (USD) in Diagnosis of Extracranial Carotid Stenosis - A Comparative Study. Journal of Medicine, 12(1), 12–16. https://doi.org/10.3329/jom.v12i1.6926