Aydin, A., M. Sahin, E. Atik, N. Engin Aydin, and M. Sehitoglu. “Dysplasia and Neuroendocrine Differentiation in Gallbladder Carcinomas”. Annals of Medical Research, vol. 4, no. 1, May 2021, pp. 0116-9, http://www.annalsmedres.org/index.php/aomr/article/view/2553.