@misc{indiciaeb3c210c9acbf,
  title = {The unseen force.},
  author = {P E Voelpel},
  year = {1997},
  doi = {10.1097/00000446-199703000-00049},
  url = {https://pubmed.ncbi.nlm.nih.gov/9055762/},
  note = {Source identifier: 9055762}
}