Abbasi, T. A., S. A. Gilani, R. Bacha, and W. Fatima. “Comparison of Doppler and Greyscale Compression Sonography in the Diagnosis of Deep Vein Thrombosis”. Annals of King Edward Medical University, vol. 24, no. 4, Dec. 2018, https://www.annalskemu.org/journal/index.php/annals/article/view/2681.