title: Primary pulmonary hypertension, an unexplained epidemic in Sri Lanka.
mesh_terms: D000293:Adolescent; D000328:Adult; D001794:Blood Pressure; D002648:Child; D005260:Female; D005368:Filariasis / Q000150:complications; D006801:Humans; D006976:Hypertension, Pulmonary / Q000453:epidemiology* / Q000209:etiology / Q000503:physiopathology; D008297:Male; D011651:Pulmonary Artery / Q000503:physiopathology; D012737:Sex Factors; D013188:Sri Lanka