Esmat, G., M. E. Raziky, A. Elsharkawy, D. Sabry, A. Mohamed Hassany, A. Ahmed, N. Assem, M. El Kassas, and W. D,  "Impact of vitamin D supplementation on sustained virological response in chronic hepatitis C genotype 4 patients treated by pegylated interferon/ribavirin",  Journal of Interferon & Cytokine Research, vol. 35, issue 1, pp. 49-54, 2015.