Zangeneh, Z., H. Golmoghaddam, M. Emad, N. Erfani, and M. Doroudchi. “Elevated PD-1 Expression and Decreased Telomerase Activity in Memory T Cells of Patients With Symptomatic Herpes Zoster Infection”. Cellular and Molecular Biology, vol. 60, no. 4, Nov. 2014, pp. 13-21, https://mail.cellmolbiol.org/index.php/CMB/article/view/514.