@misc{indiciae8c16552610a8,
  title = {Relaxation training in school classes does not reduce headache complaints.},
  author = {J Passchier and M B van den Bree and H H Emmen and S O Osterhaus and J F Orlebeke and F Verhage},
  year = {1990},
  doi = {10.1111/j.1526-4610.1990.hed3010660.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2272818/},
  note = {Source identifier: 2272818}
}