El Sayed Salem, Perihan, Mohamed El Hassafy, Dalia El Neely, and Al Shimaa Abo Shady. 2020. “Serum Copeptin and Vitamin D in Patients With Acute on Top of Chronic Liver Failure”. International Journal of Basic and Clinical Studies 9 (1):77-86. https://www.ijbcs.com/ijbcs/article/view/ijbcs09108.