Members of COR-LD are leaders in developing and validating quality of life instruments and performing PRO data analysis for patients with liver disease. Since mid-1990s, the team has developed and validated a number of disease-specific health-related quality of life instruments for liver disease (CLDQ, CLDQ-NASH, CLDQ-HCV, CLDQ-HBV, CLDQ-PSC, CLDQ-PBC). Additionally, the team has had decades of experience in analyzing PRO data. In addition to CLDQ, the team have extensive experiencing analyzing data from Short-Form 36, Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-F), Fatigue Severity Scale (FSS), Chronic Fatigue Screener (CFS), Work Productivity and Activity Instrument (WPAI). Additionally, the team is experienced in using health utilities Such as health utility index, SF6D and EQ5D.