title: Twin studies in congenital heart diseases.
mesh_terms: D001017:Aortic Coarctation / Q000235:genetics; D001024:Aortic Valve Stenosis / Q000235:genetics; D004200:Diseases in Twins / Q000151:congenital*; D004374:Ductus Arteriosus, Patent / Q000235:genetics; D006330:Heart Defects, Congenital / Q000235:genetics*; D006343:Heart Septal Defects / Q000235:genetics; D006801:Humans; D011666:Pulmonary Valve Stenosis / Q000235:genetics; D013771:Tetralogy of Fallot / Q000235:genetics