7Bhind VM,Bird NA,Waight V.A comparison of clincal assessment of disease activity in rheumatoid arthritis [J]. Annals of the Rheumatic Disease. 1980, 39: 135-137.
8Huskissm EC, Jone J,Scott PJ.Application of visual analogue scales to the Measurement of functional capacity[J]. Rheumatology and Rehabilitation,1976, 15:185-187.