Hassoun, Paul M Pulmonary hypertension as a risk factor for death in patients with sickle cell disease. [electronic resource] - The New England journal of medicine Jun 2004 - 2521-2; author reply 2521-2 p. digital Publication Type: Comment; Letter ISSN: 1533-4406 Subjects--Topical Terms: Anemia, Sickle Cell--complicationsBlood PressureCardiac OutputHumansHypertension, Pulmonary--etiologyRisk FactorsVascular ResistanceVentricular Function, Right