R. F. Tayyem, I. M. Ahmad, I. Shehadah, K. Bani-Hani, T. Al-Jaberi, and M. Al-Nusairr, “Glutathione, Vitamin D and Antioxidant Status in the Blood of Patients with Colorectal Cancer: A Pilot Study”, Pak. J. Nutr., vol. 14, no. 1, pp. 13–17, Dec. 2014, doi: 10.3923/pjn.2015.13.17.