@misc{indiciaec306efdfb8b6,
  title = {Endogenous pain control mechanisms.},
  author = {E L Spierings},
  year = {1979},
  doi = {10.1002/ana.410060131},
  url = {https://pubmed.ncbi.nlm.nih.gov/507772/},
  note = {Source identifier: 507772}
}