@misc{indiciae0e7c8dd71905,
  title = {Visual analogue scales: a source of error.},
  author = {S Snow and J R Kirwan},
  year = {1988},
  doi = {10.1136/ard.47.6.526},
  url = {https://pubmed.ncbi.nlm.nih.gov/3382273/},
  note = {Source identifier: 3382273}
}