@misc{indiciae8f4d941e4a13,
  title = {Follow-up study: protective immunization in the elderly.},
  author = {F L Ruben and P Fireman},
  year = {1983},
  doi = {10.2105/ajph.73.11.1330},
  url = {https://pubmed.ncbi.nlm.nih.gov/6625045/},
  note = {Source identifier: 6625045}
}