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Serum high-mobility group box 1 (HMGB1) levels in patients with different types of pulmonary arterial hypertension (PAH). CTD-PAH: connective tissue disease–associated PAH; CTPH: chronic thromboembolic pulmonary hypertension; CHD-PAH: congenital heart disease–associated PAH; IPAH: idiopathic PAH. **P < 0.01.
