@misc{indiciaeaaa3e3869bf8,
  title = {Free thyroxine index.},
  author = {F Clark and H J Brown},
  year = {1970},
  doi = {10.1136/bmj.2.5710.672},
  url = {https://pubmed.ncbi.nlm.nih.gov/4193679/},
  note = {Source identifier: 4193679}
}