@misc{indiciae8c394c9d9e49,
  title = {Perforated duodenal ulcer.},
  author = {W A de Boer},
  year = {1997},
  doi = {10.1056/nejm199710023371417},
  url = {https://pubmed.ncbi.nlm.nih.gov/9312675/},
  note = {Source identifier: 9312675}
}