@misc{indiciae9112f25d1d78,
  title = {Smallpox and vaccination.},
  author = {Norman R Grist},
  year = {2003},
  doi = {10.1016/s0140-6736(03)12939-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/12686073/},
  note = {Source identifier: 12686073}
}