@article{gunnar e. carlsson1999and,
  title={Epidemiology and Treatment Need for Temporomandibular Disorders},
  author={gunnar e. carlsson},
  journal={Journal of Oral & Facial Pain and Headache},
  volume={13},
  number={4},
  pages={232--237},
  doi = {10.11607/jofph.13232},
  year={1999}
}