Islam Shah, Wiqas Ahmad, Farooque Islam, Muhammad Hanif Hadi, Jawad Mahmood, Muhammad Kashif. “Vitamin D Deficiency in Patients With Chronic Liver Disease: A Clinical Study at A Tertiary Care Hospital”. Pakistan Journal of Medical & Health Sciences, vol. 16, no. 12, Feb. 2023, p. 740, doi:10.53350/pjmhs20221612740.