@misc{indiciae045aefe54489,
  title = {A simplified method for measuring thyroidal uptake of technetium-99m using directional counting.},
  author = {H W Gray and L A Hooper and W R Greig},
  year = {1973},
  doi = {10.1677/joe.0.0590001},
  url = {https://pubmed.ncbi.nlm.nih.gov/4800399/},
  note = {Source identifier: 4800399}
}