@article{dominik ettlin2009(pictorial,
  title={PRISM (Pictorial Representation of Illness and Self Measure): A Novel Visual Instrument to Assess Pain and Suffering in Orofacial Pain Patients},
  author={marie-luise streffer,stefan büchi,hanspeter mörgeli,ursula galli,dominik ettlin},
  journal={Journal of Oral & Facial Pain and Headache},
  volume={23},
  number={2},
  pages={140--146},
  doi = {10.11607/ofph.23.2.06},
  year={2009}
}