BEKTAŞ, Ahmet, et al. “The Effect of Interferon Therapy on Serum Soluble Interleukin-2 Receptor Levels in Patients With Chronic Active Hepatitis-8 and C”. Turkish Journal of Gastroenterology, vol. 6, no. 2, Jan. 1995, pp. 198-05, https://www.turkjgastroenterol.org/index.php/tjg/article/view/605.