title: Seasonal occurrence of complex ventricular septal defect.
mesh_terms: D001017:Aortic Coarctation / Q000150:complications; D001722:Birth Order; D001724:Birth Weight; D004374:Ductus Arteriosus, Patent / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology; D004777:Environment; D005260:Female; D005865:Gestational Age; D006344:Heart Septal Defects, Atrial / Q000453:epidemiology; D006345:Heart Septal Defects, Ventricular / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D007223:Infant; D008404:Massachusetts; D008423:Maternal Age; D011156:Population Density; D011666:Pulmonary Valve Stenosis / Q000453:epidemiology; D012424:Rural Population; D012621:Seasons; D014505:Urban Population