Systemic sclerosis
True comorbidity is the independent occurrence of more than one disease in a patient. In a disease like systemic sclerosis (SSc) which involves almost all organs, it is problematic to define comorbidity. A good example is SSc and primary Sjögren's disease. Figures as high as 80% comorbidity have been published, but in the majority it may be caused by fibrosis and not inflammation and thus should b
