Reduced Circulating HIF‐1α, HIF‐2α, HIF‐3α, and VHL Levels in Patients With Pulmonary Arterial Hypertension. - Kan, Hasan; Alsancak, Yakup; Uyaner Kan, Meltem; Göktaş, Emine; Çelik, Mustafa; Gürbüz, Ahmet Seyfeddin; Düzenli, Mehmet Akif (Pulmonary Circulation, 2026)