@misc{indiciae4631f4d39cb1,
  title = {Objective evaluation of ERCP procedures: a simple grading scale for evaluating technical difficulty.},
  author = {K Ragunath and L A Thomas and W Y Cheung and P D Duane and D G Richards},
  year = {2003},
  doi = {10.1136/pmj.79.934.467},
  url = {https://pubmed.ncbi.nlm.nih.gov/12954961/},
  note = {Source identifier: 12954961}
}