Is combination biliary sphincterotomy and balloon dilation a better option than either alone in endoscopic removal of large bile-duct stones?

@article{Lee2007IsCB,
  title={Is combination biliary sphincterotomy and balloon dilation a better option than either alone in endoscopic removal of large bile-duct stones?},
  author={Jeffrey S. Lee},
  journal={Gastrointestinal endoscopy},
  year={2007},
  volume={66 4},
  pages={727-9}
}