@misc{indiciae1fc424bf5e06,
  title = {Perforated duodenal ulcers.},
  author = {J Boey and J Wong},
  year = {1987},
  doi = {10.1007/bf01658109},
  url = {https://pubmed.ncbi.nlm.nih.gov/3604239/},
  note = {Source identifier: 3604239}
}