Ahmad, M. S. ., N. . Dawood, S. . Abaidullah, R. . Nazim, and S. . Iqbal. “Correlation Between Vitamin D Deficiency and Severity of Liver Disease Among Cirrhotic Patients”. Annals of King Edward Medical University, vol. 27, no. Special Issue (Jul-Sep), Sept. 2021, https://www.annalskemu.org/journal/index.php/annals/article/view/4648.