@misc{indiciaec7cb843f49a9,
  title = {Methotrexate and smallpox vaccination.},
  author = {J Allison},
  year = {1968},
  doi = {10.1016/s0140-6736(68)91743-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/4177233/},
  note = {Source identifier: 4177233}
}