@misc{indiciaeced290debe7d,
  title = {Letter: Poliomyelitis immunity gaps.},
  author = {N R Grist and E J Bell and D Reid and T S Wilson},
  year = {1976},
  doi = {10.1136/bmj.2.6027.107-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/1276797/},
  note = {Source identifier: 1276797}
}