@article{takashi s. kajii2005levels,
  title={Elevated Levels of β-Endorphin in Temporomandibular Joint Synovial Lavage Fluid of Patients with Closed Lock},
  author={takashi s. kajii,toru okamoto,sinya yura,akiko mabuchi,junichiro iida},
  journal={Journal of Oral & Facial Pain and Headache},
  volume={19},
  number={1},
  pages={41--46},
  doi = {10.11607/jofph.1941},
  year={2005}
}