title: Studies of pulmonary circulation in children with heart or lung disease using 13N.
mesh_terms: D006330:Heart Defects, Congenital / Q000503:physiopathology*; D006801:Humans; D008171:Lung Diseases / Q000503:physiopathology*; D009590:Nitrogen Radioisotopes; D011652:Pulmonary Circulation; D014652:Vascular Diseases / Q000503:physiopathology; D014655:Vascular Resistance; D014692:Ventilation-Perfusion Ratio
chemical_list: D009590:Nitrogen Radioisotopes