
Keywords: IIF، ایمونوفلورسانس غیر مستقیم; ANA, Antinuclear antibody; ENA, extractable nuclear antigen; CTD, connective tissue disease; HR, hazard ratio; CI, confidence interval; IIF, indirect immunofluorescence; ELISA, enzyme-linked immunosorbent assayClinical epidemiology; Autoimmunity; Survival