@misc{indiciae18e99c83635f,
  title = {No appointment needed; the headache clinic.},
  author = {O Appenzeller},
  year = {1971},
  doi = {10.1111/j.1526-4610.1971.hed1103133.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5115599/},
  note = {Source identifier: 5115599}
}