@misc{indiciaef1a3383438db,
  title = {How many different headaches do you have?},
  author = {W F Laughey and E A MacGregor and M I Wilkinson},
  year = {1993},
  doi = {10.1046/j.1468-2982.1993.1302136.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/8495458/},
  note = {Source identifier: 8495458}
}