@misc{indiciaea19e1bed2689,
  title = {Polio immunisation in pregnancy.},
  author = {J Twomey},
  year = {1977},
  doi = {10.1136/bmj.2.6097.1285},
  url = {https://pubmed.ncbi.nlm.nih.gov/589142/},
  note = {Source identifier: 589142}
}