TY  - RPRT
TI  - Visual analogue scales: a source of error.
AU  - S Snow
AU  - J R Kirwan
PY  - 1988
DO  - 10.1136/ard.47.6.526
UR  - https://pubmed.ncbi.nlm.nih.gov/3382273/
ID  - 3382273
ER  -