@misc{indiciae28180b81982c,
  title = {Headache diagnosis.},
  author = {R E Ryan},
  year = {1999},
  doi = {10.1016/s1098-3597(99)90036-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/10682184/},
  note = {Source identifier: 10682184}
}