title: How do we explain unexplained pulmonary hypertension in the elderly?
authors.forename: Stuart
authors.initials: S
authors.lastname: Rich
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012042:Registries; D012307:Risk Factors; D014481:United States / Q000453:epidemiology