SAPMAZ, Ayşegül, et al. “Effects of Polymorphism in G2677T A Triallelic Region of MDR1 Gene in Turkish Patients With Inflammatory Bowel Disease”. Turkish Journal of Gastroenterology, vol. 19, no. 3, Jan. 2008, pp. 168-73, https://turkjgastroenterol.org/index.php/tjg/article/view/1655.