@misc{indiciae2140ef0bfc2f,
  title = {R factors.},
  author = {M J Lewis},
  year = {1969},
  doi = {10.1093/infdis/120.5.630},
  url = {https://pubmed.ncbi.nlm.nih.gov/4899612/},
  note = {Source identifier: 4899612}
}