@misc{indiciaeafa8967689e4,
  title = {Peripheral opioid systems in cluster headache.},
  author = {M L Figuerola and O Vindrola and J Leston and M Barontini},
  year = {1994},
  url = {https://pubmed.ncbi.nlm.nih.gov/7954749/},
  note = {Source identifier: 7954749}
}