@misc{indiciae0a40c01224d7,
  title = {Cluster headache and its variants.},
  author = {J M Pearce},
  year = {1992},
  doi = {10.1136/pgmj.68.801.517},
  url = {https://pubmed.ncbi.nlm.nih.gov/1437946/},
  note = {Source identifier: 1437946}
}