Pulmonary hypertension of un-explained origin in Ceylon.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D013188:Sri Lanka