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Polymorphonuclear (PMN) elastase level and PMN elastase-to-neutrophil ratio (ENR) in other autoimmune diseases. PMN elastase levels (a) and ENR (c) in patients with systemic lupus erythematosus (SLE), systemic sclerosis (SSc), and rheumatoid arthritis (RA) when compared with HCs. PMN elastase levels (b) and ENR (d) in patients with active SLE, SSc, and RA when compared with those in remission
