@misc{indiciaea98d47641543,
  title = {Physical exercise, endogenous opioids and immune function.},
  author = {I H Jonsdottir and P Hoffmann and P Thorèn},
  year = {1997},
  url = {https://pubmed.ncbi.nlm.nih.gov/9401605/},
  note = {Source identifier: 9401605}
}