title: Primary pulmonary hypertension.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000150:complications / Q000453:epidemiology* / Q000473:pathology; D007194:India; D008297:Male; D011651:Pulmonary Artery / Q000473:pathology; D012737:Sex Factors; D012959:Socioeconomic Factors