Farrukh, Syed Zea-ul-Islam, et al. “COMPARISON OF ULTRASOUND EVALUATION OF PATIENTS OF OBSTRUCTIVE JAUNDICE WITH ENDOSCOPIC RETROGRADE CHOLANGIO-PANCREATOGRAPHY FINDINGS”. Journal of Ayub Medical College Abbottabad, vol. 28, no. 4, Nov. 2016, pp. 650-2, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/1294.