@article{null,
  title={},
  author={petri tiilikainen,aune raustia,pertti pirttiniemi},
  journal={Journal of Oral & Facial Pain and Headache},
  volume={25},
  number={1},
  pages={68--74},
  doi = {10.11607/jofph.25.1.09},
  year={2011}
}