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The European Scleroderma Study Group (EScSG) has recently identified three activity 10 point indices devoted to evaluating disease activity in systemic sclerosis (SSc) (table 1),1 which have been externally validated.2
An activity index must rely on widely used methods.3 The whole series index includes the total skin score (TSS) evaluated according to the scoring method of Kahaleh et al (KTSS).4 Because, at present, the modified Rodnan TSS (mRTSS)5 is the method most widely used to assess skin induration in SSc, we considered that the …