@article{per alstergren1999pain,
  title={TMJ Pain in Relation to Circulating N europeptide Y, Serotonin, and Interleukin-1 β in Rheumatoid Arthritis},
  author={per alstergren,malin ernberg,sigvard kopp,tomas lundeberg,elvar theodorsson},
  journal={Journal of Oral & Facial Pain and Headache},
  volume={13},
  number={1},
  pages={49--55},
  doi = {10.11607/jofph.1349},
  year={1999}
}