Zaid, N. A., M. S. El Desoky, and S. F. Attia. “Reducing Ultrasound in Diagnosing Deep Vein Thrombosis by Using Clinical Scores and D-Dimer Testing”. International Surgery Journal, vol. 7, no. 2, Jan. 2020, pp. 332-7, doi:10.18203/2349-2902.isj20200279.