title: Proceedings: Observations on the aetiology of unexplained or primary pulmonary hypertension.
mesh_terms: D000328:Adult; D003095:Collagen Diseases / Q000150:complications; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000209:etiology* / Q000235:genetics; D007105:Immune Complex Diseases; D008297:Male; D011247:Pregnancy; D011655:Pulmonary Embolism / Q000150:complications