title: Letter: Seasonal occurrence of ventricular septal defect.
mesh_terms: D004374:Ductus Arteriosus, Patent / Q000150:complications; D005260:Female; D005865:Gestational Age; D006345:Heart Septal Defects, Ventricular / Q000150:complications / Q000453:epidemiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011247:Pregnancy; D011666:Pulmonary Valve Stenosis / Q000150:complications; D012621:Seasons