2DeOliveira ML, Cunningham SC, CameronJL, et al. Cholangiocarcinoma: thirty-one-year experience with 564 patients at a single institution. Ann Surg,2007,245 ( 5 ) :755 - 762.
3Neumaier CE, Bertolotto M, Perrone R, et al. Clinical staging of hilar cholangiocarcinoma with ultrasound. J Clin Ultrasound, 1995, 23 (3) : 173 - 178.
4Manfredi R, Brizi MG , Masselli G, et al. Malignant biliary hilar stenosis : MR cholangiography compared with direct cholangiography. Radiol Med,2001,102( 1 -2) :48 -54.
5Neumaier CE,Bertolotto M,Perrone R,et al.Clinical staging of hilar cholangiocarcinoma with ultrasound.J Clin Ultrasound,1995,23:173-178.