Nakeeb, A., Pitt, H.A., Sohn, T.A., Coleman, J., Abrams, R.A., Piantadosi, S., Hruban, R.H., Lillemoe, K.D., Yeo, C.J. and Cameron, J.L. (1996) Cholangiocarcinoma. A spectrum of intrahepatic, perihilar, and distal tumors. CA: A Cancer Journal for Clinicians, 224, 463-473; discussion 473-475.