Assessing Disability and Quality of Life in Systemic Sclerosis: Construct Validities of the Cochin Hand Function Scale, Health Assessment Questionnaire (HAQ), Systemic Sclerosis HAQ, and Medical Outcomes Study 36-Item Short Form Health Survey

Systemic sclerosis (SSc) is a connective tissue disease characterized by excessive collagen deposition and by vascular hyperreactivity and obliterative microvascular phenomena (1).