@misc{indiciae529ddaf91b00,
  title = {Cluster headache and its variants.},
  author = {O Sjaastad},
  year = {1988},
  doi = {10.1111/j.1526-4610.1988.hed2810667.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/3229999/},
  note = {Source identifier: 3229999}
}