@misc{indiciae63531b53c499,
  title = {US changes polio vaccination programme.},
  author = {D Johnson},
  year = {1997},
  doi = {10.1136/bmj.314.7079.461i},
  url = {https://pubmed.ncbi.nlm.nih.gov/9056792/},
  note = {Source identifier: 9056792}
}