How is the classification of systemic sclerosis?

Limited cutaneous systemic sclerosis (lcSSc, skin involved only distal to knees and elbows) Diffuse cutaneous systemic sclerosis (dcSSc, skin thickening proximal to knees and elbows) SSc sine scleroderma (vascular and serological features without skin involvement) EUSTAR (Vedoss very early dx of SSc, three red flags (Raynaud's phenomenon, puffy fingers and ANAs plus 1 of (disease-specific autoantibodies [ACA/anti-topo], or microvascular alterations detected by nailfold videocapillaroscopy)