Benign neoplasms of the extrahepatic biliary ducts.

@article{Burhans1971BenignNO,
  title={Benign neoplasms of the extrahepatic biliary ducts.},
  author={R Burhans and Robert A. Myers},
  journal={The American surgeon},
  year={1971},
  volume={37 3},
  pages={161-6}
}