@misc{indiciaeec4e002ce8cd,
  title = {Endogenous opiates: 1998.},
  author = {A L Vaccarino and G A Olson and R D Olson and A J Kastin},
  year = {1999},
  doi = {10.1016/s0196-9781(99)00166-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/10698131/},
  note = {Source identifier: 10698131}
}