Patel, Ami, et al. “Sonographic Assessment of Internal Jugular Vein and Carotid Artery to Correlate Development of Spinal Hypotension in Geriatric Patients”. Pain Medicine, vol. 10, no. 3-4, Dec. 2025, pp. 27-38, doi:10.31636/pmjua.v10i3-4.3.