@misc{indiciaeb263766ba778,
  title = {Primary duodenal carcinoma developing from polyposis.},
  author = {B U Sievers},
  year = {1972},
  doi = {10.1007/bf00556318},
  url = {https://pubmed.ncbi.nlm.nih.gov/4623027/},
  note = {Source identifier: 4623027}
}