@misc{indiciae9023505db2c7,
  title = {Immunization status and birth order.},
  author = {S J Schaffer and P G Szilagyi},
  year = {1995},
  doi = {10.1001/archpedi.1995.02170200082013},
  url = {https://pubmed.ncbi.nlm.nih.gov/7795771/},
  note = {Source identifier: 7795771}
}