Retraction Notice: Fractional-order modeling of visceral leishmaniasis disease transmission dynamics: strategies in eastern Sudan. J. Nig. Soc. Phys. Sci. [Internet]. 2026 Apr. 26 [cited 2026 Apr. 27];8(2):3465. Available from: https://journal.nsps.org.ng/index.php/jnsps/article/view/3465