@misc{indiciaeef6a97ce5dff,
  title = {Headache classification based on questionnaire data: which symptoms are especially suitable?},
  author = {T Köhler and R Eisentraut and E Graeber},
  year = {1995},
  doi = {10.1016/0895-4356(94)00182-p},
  url = {https://pubmed.ncbi.nlm.nih.gov/7769410/},
  note = {Source identifier: 7769410}
}