@misc{indiciaea7e460331462,
  title = {A probability model of headache recurrence.},
  author = {A Leviton and J Schulman and L Kammerman and D Porter and W Slack and J R Graham},
  year = {1980},
  doi = {10.1016/0021-9681(80)90038-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/7380975/},
  note = {Source identifier: 7380975}
}