KHAN, MOHAMMAD, Faris Altaf, and Muhammad Hijazi. “A CASCADE OF UNICUSPID VALVES IN THE INTERNAL JUGULAR VEIN”. KHYBER MEDICAL UNIVERSITY JOURNAL 8, no. 3 (January 25, 2017): 147. Accessed August 15, 2020. https://www.kmuj.kmu.edu.pk/article/view/15461.