@misc{indiciae435f4e820dfc,
  title = {PRACTICAL PROBLEMS OF VACCINATION CAMPAIGNS.},
  author = {A MCGREGOR},
  year = {1963},
  doi = {10.1016/s0033-3506(63)80076-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/14050430/},
  note = {Source identifier: 14050430}
}