@misc{indiciae85c17f68103a,
  title = {Persistent serum immune complexes in syphilis.},
  author = {S Engel and W Diezel},
  year = {1980},
  doi = {10.1136/sti.56.4.221},
  url = {https://pubmed.ncbi.nlm.nih.gov/7427696/},
  note = {Source identifier: 7427696}
}