Valecchi, Debora, Duccio Bacci, Massimo Gulisano, Eleonora Sgambati, Maurizio Sibilio, Mario Lipoma, and Claudio Macchi. “Internal Jugular Vein Valves: An Assessment of Prevalence, Morphology and Competence by Color Doppler Echography in 240 Healthy Subjects”. Italian Journal of Anatomy and Embryology 115, no. 3 (December 10, 2010): 185–189. Accessed November 24, 2024. https://oajournals.fupress.net/index.php/ijae/article/view/1079.