@misc{indiciaec687586ab257,
  title = {Changing advice on vaccination.},
  author = {N W Preston},
  year = {1979},
  doi = {10.1136/bmj.1.6157.194-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/421010/},
  note = {Source identifier: 421010}
}