Szajnbock, I., Lorenzi, F., Rodrigues Jr., A. J., Zantut, L. F. C., Poggetti, R. S., Steinman, E., & Birolini, D. (1996). Gallstone ileus as a cause of upper intestinal obstruction. São Paulo Medical Journal, 114(4), 1239–1243. Retrieved from https://periodicosapm.emnuvens.com.br/spmj/article/view/2009