@misc{indiciaee31ecc845807,
  title = {Investigating severe headache.},
  author = {W Harkness},
  year = {1990},
  doi = {10.1177/014107689008300630},
  url = {https://pubmed.ncbi.nlm.nih.gov/2380973/},
  note = {Source identifier: 2380973}
}