@misc{indiciae9924bc0a6a17,
  title = {Visual analog scale (VAS).},
  author = {E W Johnson},
  year = {2001},
  doi = {10.1097/00002060-200110000-00001},
  url = {https://pubmed.ncbi.nlm.nih.gov/11562551/},
  note = {Source identifier: 11562551}
}