The purpose of this study is to investigate the role of nailfold capillaroscopy in the assessment of patients with Systemic Lupus Erythematosus (SLE). Primary endpoint: \- To compare the frequency of major capillaroscopic abnormalities in patients with SLE and healthy controls. Secondary endpoints: * To compare the frequency of major capillaroscopic abnormalities in patients with active and non-active SLE / active SLE and healthy controls / non-active SLE and healthy controls. * To study the association of different capillaroscopic parameters and the status of subjects (SLE / active SLE / non-active SLE / healthy controls).
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major capillary abnormalities
Timeframe: Day 1