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sCD40L (individual plasma concentrations (pg/ml) and median values) in patients with systemic sclerosis (SSc, n = 50) and controls (n = 20); in SSc patients with (n = 14) and without digital ulcers (n = 36); and in SSc patients with (n = 10) and without (n = 40) pulmonary arterial hypertension (PAH).
