Randi G., S. Franceschi and C. La Vecchia, 2006, " Gallbladder cancer worldwide: Geographical distribution and risk factors" , International Journal of Cancer, Vol. 118(7), pp. 1591-1602.
Randi G., S. Franceschi en C. La Vecchia, 2006, ‘Gallbladder cancer worldwide: Geographical distribution and risk factors’, International Journal of Cancer, Vol. 118(7), pp. 1591–1602.