Parra, S. R. M., O. S. Sánchez, R. M. Ibarra, C. Z. D. Barrientos, C. A. M. Gandarillas, and J. M. E. González. “Gallbladder Agenesis in a Patient With Choledochoduodenal Fistula, Report of an Exceptional Case”. International Journal of Research in Medical Sciences, vol. 11, no. 8, July 2023, pp. 3012-6, doi:10.18203/2320-6012.ijrms20232145.