This definition appears very rarely
See other definitions of VASL
Samples in periodicals archive:
Pain, 17 (1983) 45-56 Elsevier 45 The Validation of Visual Analogue Scales as Ratio Scale Measures for Chronic and Experimental Pain
Subjective pain score; Visual analogue scale (VAS); deep breathe and cough for thoracic injury or move affected leg for lower limb pain).
Pain rating scale instructions,Visual analogue scale (VAS),Numerical rating scale (NRS),Faces rating scale (FRS),Behavioural pain rating scale,Functional activity score