@misc{indiciaeeec7188ffb2d,
  title = {Solved and unsolved headache problems.},
  author = {J W Lance},
  year = {1991},
  doi = {10.1111/j.1526-4610.1991.hed3107439.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/1774158/},
  note = {Source identifier: 1774158}
}